Surveys of partner counts run into a problem mathematicians spotted long ago
Men on average report more lifetime sexual partners than women. Mathematicians point out that, among heterosexual people, this cannot be true on average, since every such pairing adds one partner to each side. The gap says as much about how people report desire as about desire itself.
Sexual desire is a feeling and a motivation: interest in sexual activity, or a drive to seek it out. It varies widely between people, shifts with circumstances and may be the most common sexual experience in human life. Internal cues like fantasy or external ones like seeing someone attractive can trigger it, and it may or may not lead to any action. It can arise spontaneously or in response to something, and ranges from faint to intense.
Researchers approach it through two main lenses. The biological view treats sex drive, or libido, like hunger, an innate urge shaped by hormones, nutrition, age and health. In the classic response cycle, desire comes first, followed by arousal, orgasm and resolution, though some argue it persists through all of them. The sociocultural view places desire inside relationships, societies and cultures, where people may seek sex for closeness or other rewards and have more conscious control. The philosopher James Giles proposed a third idea: desire as an existential need, rooted in the sense of incompleteness that comes from being gendered. Stephen Levine tried to unite the camps with three parts, a biological drive, a psychological motivation and a cultural wish.
Across nations, Richard Lippa's analysis of a BBC internet survey found men reporting stronger and more frequent desire on average, with women's levels more variable. When women do feel desire, though, its intensity matches men's. Feelings also shape desire in unexpected directions: in one study, women who called sex important to their lives reported lower desire than women who gave it less weight, and men showed a similar pattern. Female sexuality also appears to stay more flexible across life, a quality researchers call erotic plasticity.
Biology keeps intervening. Desire in women tends to rise around ovulation and dip during menstruation, and pregnancy, breastfeeding and menopause can all shift it. A sharp fall in androgen production can switch off sexual thoughts altogether, as seen in some postmenopausal women with low testosterone.
Source: Sexual desire
