The Fundamentals of Sex

Sexual desire involves both biology and psychologycan be unpredictableand can manifest very differently in men and in women. For menarousal typically precedes desire. But for womendesire often precedes arousalin response to physical intimacyemotional connectionand an atmosphere free of distraction.

Researchers studying human desire explore the interplay of biological influences such as neurohormones and psychological influences such as emotions and relationship factors. Smell often plays a subtle role in attraction; research shows that women are attracted to mates whose natural body odoror pheromonessignals a genetic profile distinct from their own.

Low sexual desire is common among both men and women but it can often be resolved within couples by addressing conflictsmore consistently exchanging affection and conversation outside the bedroomand making sufficient time for sex.

To learn moresee Sexual Attraction and Desire and How Men and Women Think About Sex.

The pleasure of sex arises from factors including the release of neurochemicals such as oxytocin and dopamineand the sense of connection expressed through touchingmassagingand cuddling.

There is no one way to be sexualand there is enormous variation in the activities that people find arousing. Men are especially stimulated by visual imagery: About 90 percent of young men report using pornography with some regularity. Many couples today engage in behaviors that were once perceived as atypicalincluding dominance play and anal intercourse. Researchers now understand that flexibility in sexual repertoires is healthy and generally enhances relationships. Clinicians regard specific behaviors as problematic only when they create harm or distress for one or both partners or when the behavior is compulsive—that iswhen it becomes the only means of arousal.

"Sex addiction" is a label often used to suggest an excessive or pathological interest in sexbut it is not a recognized clinical diagnosis and studies show that this perception tends to be tied more to an individual's moral or religious outlook than to their actual sexual practice.

To learn more see ArousalOrgasm and Post-Coital Behavior and Hookups and Casual Sex.

Sexual behavior changes over timeand the trajectory of change may vary between men and women.

Young women may have difficulty navigating cultural attitudes about sexual behavior and promiscuity as they begin to explore their sexualitybut age tends to bring confidence and greater skill at communicating their needs and desires. Young men often have concerns about performancepenis sizeor premature ejaculation. Anxiety is a threat to performance for either men or women.

Couples tend to report that their sex life is most robust in their 30s and 40sbut sex is often most deeply rewarding for older partners. People can enjoy satisfying sex throughout the lifespan if they make adjustments for the many changes that time bringssuch as relying less on penile penetration and more on massagewhole-body touchingand oral sex.

To learn moresee Sex in Long-Term Relationships and Sexual Concerns.

A wide variety of behaviorspreferencesand quirks are recognized as part of healthy sexual activity. A sexual behavior becomes a disorderhoweverwhen it leads to significant distressthreatens to harm othersor becomes compulsive.

There is a range of clinically recognized sexual disorders. Erectile disorderalso called erectile dysfunctionis a chronic inability to get or to maintain an erection. Orgasmic disorder may be diagnosed when a woman is not able to reach orgasmand genito-pelvic pain or penetration disorder refers to the experience of extreme pain during penetrative sex. And paraphilias such as pedophilia and fetishistic disorder are present when a person’s sexual arousal depends on fantasizing about or engaging in disturbing or extreme sexual behavior.

For more informationsee Sexual Disorders and the Diagnosis Dictionary.