Being a sex addict is something else. Men have a bigger need for sex then women because they have testosterone, the male hormone, and women doesn't have as much as men do. Testosterone is what makes us horny and grow hair.
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Not all men are preoccupied with sex, but men do tend to be more preoccupied with sex than women. In adolescents and young adults this is due largely to differences in levels of the hormone testosterone. Testosterone is linked to sex drive in both men and women: both sexes produce testosterone naturally, but men produce it in greater quantities while women also produce estrogen, which counterbalances many of the effects of testosterone. Young males will tend to have a greater sex drive than any other segment of the population for purely hormonal reasons.
However, sex drive is only part of the issue. In almost every culture, adolescent and young males are socialized to place a high value on promiscuous activity, and suffer few punishments for pursuing it. Independence, social status, and self-esteem for males who are college age or less are almost invariably tied to sex and sexual partners, or to competitive testosterone-releasing activities such as sports. The high sex drive of young males combined with the competitive pressures and broad social latitude given to males around sexuality, encourages a somewhat compulsive attachment to sexuality which can last a lifetime, and certainly extends past the the primary years of testosterone production (which drops off dramatically in the twenties and beyond).
By nature, the male gender is supposed to have sex with a female to reproduce. To answer your question, men have such a sex drive because
it is pure instinct.