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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.
It is related to the idea that opposition between two people can heighten sexual tension, attraction and interest.
It has been shown that sexual activity plays a large part in the interaction of social species.
Joan Roughgarden, in her book Diversity, Gender, and Sexuality in Nature and People, postulates that this applies equally to humans as it does to other social species.
She explores the purpose of sexual activity and demonstrates that there are many functions facilitated by such activity including pair bonding, group bonding, dispute resolution and reproduction.
Most commonly, people engage in sexual activity because of the sexual desire generated by a person to whom they feel sexual attraction; but they may engage in sexual activity for the physical satisfaction they achieve in the absence of attraction for another, as in the case of casual or social sex.
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, navels or foot worship.
Although the primary evolutionary purpose of sexual activity is reproduction, research on college students suggested that people have sex for four general reasons: physical attraction, as a means to an end, to increase emotional connection, and to alleviate insecurity.
Most people engage in sexual activity because of pleasure they derive from the arousal of their sexuality, especially if they can achieve orgasm.
A man and woman may engage in sexual intercourse with the objective of conception.