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Sexual arousal, or sexual excitement, is the arousal of sexual desires in anticipation for sexual activity. Things that precipitate human sexual arousal are colloquially known as turn-ons. Sexual arousal usually leads to physiological changes in the aroused person, some of which are pronounced while others are more subtle.

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Human sexual arousal

People can be sexually aroused by different things and in a variety of situations. An arousal may be physical or mental in nature. A person may be sexually aroused by another person or by particular aspects of that person (eg.: hair color, build, smell, smile, breasts, genitals etc) or by a non-human object. When a person is sexually aroused by another person, it may be seen as an indicator of that person's sexual orientation.[citation needed] When sexual arousal is achieved by or dependent on the use of objects, it is referred to as sexual fetishism. This also includes sexual arousal which arises from another person's body part. Most people are sexually aroused by a physical stimulation of an erogenous zone, especially if it is accompanied with the anticipation of imminent sexual activity. People often describe the sensation's of sexual arousal as tingles, which in males is felt in the penis, and in females can be a full-body experience, ultimately, this process ends in orgasm for both sexes, this can either be felt in the genital or full body, regardless of gender, can be ejaculatory or non-ejaculatory, and can be highly pleasurable or not pleasurable at all, after the orgasm the human body enters a relaxed state, yet, ejaculation can drain people, and make them feel tired and unable to do activities, that is why non-ejaculatory orgasm is often practiced, as well as the fact that this can result in a full body orgasm. See Tantric sex. In addition, many people may find nudity, erotica and pornography sexually arousing, though what aspect different people find arousing will vary. Most people are visually stimulated by nudity or partial nudity of the opposite or same sex or by seeing a sexual act performed by others, and some are also stimulated by the state of romance with their partner.[1] According to the marital and sex therapist, David Schnarch, intimacy, the honest portrayal of the two people joining in the sexual act, may lead to a heightened state of passion in sex, including sexual arousal.[2] Such sexual arousal may not lead to an actual sexual activity, beyond a mental arousal. In a 2004 study at Northwestern University, the female participants (both heterosexual and homosexual women) became sexually aroused when they viewed straight as well as lesbian erotic films. Among the male participants, however, the heterosexual men were turned on only by erotic films showing women; the gay males were aroused only by films showing men. The study's senior researcher said that women's sexual desire is less rigidly directed toward a particular gender, as compared with men's; and women's desire is more changeable over time.[3] Sexual arousal may also be assisted by a romantic setting, music, or other soothing situations. Given the right stimulation, sexual arousal in humans will typically end in an orgasm, but may be pursued for its own sake, even in the absence of an orgasm. Some people may experience a sexual arousal disorder. This may be characterized as a lack or absence of sexual fantasies and desire for sexual activity for a period of time. This may be caused by a mental disorder, such as depression, drug use, or some other medical condition. The lack of sexual arousal may be due to a general lack of sexual desire or due to a lack of sexual desire for the current partner. The lack of desire may be acquired (i.e. it may have started after a period of normal sexual functioning) or life-long (the person has always had no/low sexual desire). Unlike most animals, human beings of both sexes are potentially capable of sexual arousal throughout the year; therefore, there is no human mating season.

Physiological changes

Sexual arousal for a man is usually indicated by the swelling and erection of the penis when blood fills the corpus cavernosum. This is usually the most prominent and reliable sign of sexual arousal in males; however, adolescent males experience 'non-sexual' erections stemming from high levels of testosterone.
In a woman, sexual arousal usually leads to vaginal lubrication in anticipation of sexual intercourse. Sexual arousal causes different physical changes.[citation needed]

In females:

In males:

Female sexual arousal.JPG
Female sexual arousal. In the left image female genitalia are in normal state. In the right image the female is sexually aroused, the vulva is wet and the labia are slightly engorged.

Flaccid and erect penis.jpg
Male sexual arousal.

Human sexual response cycle

During the 1950s and 1960s, William H. Masters and Virginia E. Johnson conducted many important studies within the field of human sexuality. In 1966, they released a book, Human Sexual Response, detailing four stages of physiological changes in humans during sexual stimulation. These phases, in order of their occurrence, are excitement, plateau, orgasm, and resolution.[5]

The effect of sexual response is thought to be a plastic positive reinforcement behavior modifier associated with the Baldwin Effect. The end result of these sorts of things can be very novel structures such as the Pseudo-penis of the female Spotted Hyena.[6] The display of secondary sex characteristics in humans such as a penis-like enlarged clitoris in females during arousal and gynecomastia in males are thought to have once been objects of mate selection in human evolution because of the persistence of the phenomenon of these features invoking sexual arousal for potential mates in cross-cultural studies.[7] A dramatic example of this is the high rates of secondary sex characteristic dimorphism in some Southeast Asia human populations.[8]

Singer's model of sexual arousal

Singer[9] presents a model of the process of sexual arousal, in which he conceptualized human sexual response to be composed of three independent but generally sequential components. The first stage, aesthetic response, is an emotional reaction to noticing an attractive face or figure. This emotional reaction produces an increase in attention toward the object of attraction, typically involving head and eye movements toward the attractive object. The second stage, approach response, progresses from the first and involves bodily movements towards the object. The final genital response stage recognizes that with both attention and closer proximity, physical reactions result in genital tumescence. Singer also notes that there is an array of other autonomic responses, but acknowledges that the research literature suggests that the genital response is the most reliable and convenient to measure in males.

Sexual arousal in animals

While human sexuality is well understood, scientists do not completely grasp how other animals relate sexually. However, current research studies suggest that many animals, like humans, enjoy sexual relations that are not limited to reproduction. Dolphins and Bonobos, for example, are both well known to use sex as a "social tool to strengthen and maintain bonds."[10] Ethologists have long documented the exchanges of sex to promote group cohesion in social animals. Cementing social bondage is one of the most prominent theorized selective advantages of group selection theory. Experts in the evolution of sex such as John Maynard Smith advocate for the idea that the exchange of sexual favors helps congeal and localize the assortment of alleles in isolated population and therefore is potentially a very strong force in evolution. Maynard Smith also has written extensively on the "seminal fluid swapping theory" logistic application of the assortment of alleles as a more accurate synthetic depiction of the Hardy Weinberg Equilibrium in cases of severely interbreeding populations.

See also

References

  1. ^ Dobson, Dr. James. "What are the differences in sexual desire and preferences between males and females". Focus on the Family. 2008-12-26 http://family.custhelp.com/cgi-bin/family.cfg/php/enduser/std_adp.php?p_faqid=1074.
  2. ^ DeVita-Raeburn, Elizabeth. "Lust For The Long Haul ". Psychology Today. 2008-12-26 http://www.psychologytoday.com/articles/index.php?term=20051209-000001&page=4.
  3. ^ http://www.cnn.com/2009/LIVING/personal/04/23/o.women.leave.menfor.women/
  4. ^ Human Sexuality - MSN Encarta
  5. ^ "The Sexual Response Cycle". SexInfo. University of California, Santa Barbara. http://www.soc.ucsb.edu/sexinfo/article/the-sexual-response-cycle. Retrieved 2007-04-24. "Masters and Johnson's Four-Phase Model: The sexual responses of men and women have many similarities...." 
  6. ^ Carey, Bjorn Painful realities of Hyena sex http://www.livescience.com/animals/060426_hyena_cubs.html
  7. ^ Miller, Geoffrey A Review of Sexual Selection and Human Evolution http://cas.bellarmine.edu/tietjen/Human%20Nature%20S%201999/SexualSelection/sex%5B1%5D.pdf
  8. ^ Harpending, Henry "Human Diversity and its History" (Bibliographic Guide to East Asian Studies, by Gale Group, Gale Group, 2001, ISBN 0783892195, 9780783892191)
  9. ^ Singer, B. Conceptualizing sexual arousal and attraction. The Journal of Sex Research. 1984; 20, 230-240
  10. ^ McCarey, Kevin (writer). (1999). Dolphins: The wild side. [Documentary]. USA: National Geographic Adventure. http://www.nationalgeographic.com/tv/press/990202.html. Retrieved 2007-04-24.  "Like humans and some chimpanzees, dolphins use sex for reasons other than procreation. Sex is as frequent as it is casual, a social tool used to strengthen and maintain bonds." 'Dolphins: The wild side' at the Internet Movie Database

Simple English

Sexual arousal is the feeling animals and humans get when they are ready to have sexual intercourse.

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Sexual arousal in people

When people become sexually aroused, their bodies change in certain ways.

In women: In men:
  • The breasts will get bigger.
  • Nipples may stiffen [1].
  • The vagina will become slippery so it is easier for the erect penis to go in.
  • Blood will fill the walls of the vagina.
  • The clitoris and labia will swell up.
  • The cervix and uterus will pull backwards.
  • The vagina will expand upwards.
  • The labia majora and labia minora will become red and swollen.
  • The penis will swell up and become stiff (erect) so it points outwards and upwards. This is the clearest sign of sexual arousal in men.
  • The veins in the penis will stand out.
  • pre-ejaculatory fluid will leak from the end of the penis to help lubricate it.
  • The foreskin will slip back, exposing the glans penis.
  • The testicles will swell and be pulled upwards.
  • The scrotum will thicken as the testicles tighten.

Animals

Animal sexuality is not very well understood today, but scientists are sure that animals do get sexually aroused without having sexual intercourse. Dolphins and Bonobos both use sex as a "social tool to strengthen and maintain bonds."[2]

Other pages

References

  1. Human Sexuality - MSN Encarta
  2. McCarey, Kevin (writer). (1999). Dolphins: The wild side [Documentary]. USA: National Geographic Television. Retrieved on 2007-04-24. "Like humans and some chimpanzees, dolphins use sex for reasons other than procreation. Sex is as frequent as it is casual, a social tool used to strengthen and maintain bonds."'Dolphins: The wild side' at the Internet Movie Database (IMDb)

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