In some cultures, sexual activity is considered acceptable only within marriage, while premarital and extramarital sex are taboo.
Some sexual activities are illegal either universally or in some countries or subnational jurisdictions, while some are considered contrary to the norms of certain societies or cultures.
It releases tension, elevates mood, and may create a profound sense of relaxation, especially in the postcoital period.
From a biochemical perspective, sex causes the release of endorphins and increases levels of white blood cells that actually boost the immune system.
Sexual activity can be regarded as conventional or as alternative, involving, for example, fetishism, paraphilia, or BDSM activities.
Fetishism can take many forms ranging from the desire for certain body parts, for example large breasts, armpits or foot worship.
A man and woman may engage in sexual intercourse with the objective of conception.
Some people engage in hate sex, which occurs between two people who strongly dislike or annoy each other.Sexual activity usually results in sexual arousal and physiological changes in the aroused person, some of which are pronounced while others are more subtle.Sexual activity may also include conduct and activities which are intended to arouse the sexual interest of another or enhance the sex life of another, such as strategies to find or attract partners (courtship and display behaviour), or personal interactions between individuals (for instance, foreplay or BDSM). Human sexual activity has sociological, cognitive, emotional, behavioural and biological aspects; these include personal bonding, sharing emotions and the physiology of the reproductive system, sex drive, sexual intercourse and sexual behaviour in all its forms.3 (June 2007): 357–68) reported that sexual behavior with a partner on one day significantly predicted lower negative mood and stress, and higher positive mood, on the following day.People engage in sexual activity for any of a multitude of possible reasons.Research has found that people also engage in sexual activity for reasons associated with self-determination theory.