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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, 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. 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.
In addition, some people may find nudity, erotica and pornography sexually arousing, though what aspect different people find arousing will vary. Most heterosexual males are visually stimulated by female nudity or partial nudity, while some heterosexual females are stimulated by the state of romance with their partner. 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. 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.
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).
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.
Male sexual arousal.*Penile tumescence and erection
Human sexual response cycle
- Main article: 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.
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. 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. A dramatic example of this is the high rates of secondary sex characteristic dimorphism in some Southeast Asia human populations.
Singer's model of sexual arousal
Singer 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." 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.
- Erogenous zone
- Female sexual arousal disorder
- Hypoactive Sexual Desire Disorder
- Human sexuality
- Inhibited sexual desire
- Kinsey report
- Non-penetrative sexual behavior
- Nudity and sexuality
- Persistent sexual arousal syndrome
- Post-SSRI sexual dysfunction
- Sex drive
- Sexual attraction
- Sexual desire
- Sexual fantasy
- Sexual frustration
- Sexual intercourse
- Sexual orientation
- Sexual risk taking
- Sexual satisfaction
- ↑ 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.
- ↑ 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.
- ↑ http://www.cnn.com/2009/LIVING/personal/04/23/o.women.leave.menfor.women/
- ↑ Human Sexuality - MSN Encarta
- ↑ The Sexual Response Cycle. SexInfo. University of California, Santa Barbara. URL accessed on 2007-04-24.
- ↑ Carey, Bjorn Painful realities of Hyena sex http://www.livescience.com/animals/060426_hyena_cubs.html
- ↑ Miller, Geoffrey A Review of Sexual Selection and Human Evolution http://cas.bellarmine.edu/tietjen/Human%20Nature%20S%201999/SexualSelection/sex%5B1%5D.pdf
- ↑ Harpending, Henry "Human Diversity and its History" (Bibliographic Guide to East Asian Studies, by Gale Group, Gale Group, 2001, ISBN 0783892195, 9780783892191)
- ↑ Singer, B. Conceptualizing sexual arousal and attraction. The Journal of Sex Research. 1984; 20, 230-240
- ↑ McCarey, Kevin (writer). 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
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