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Sexual physiology, sexual behaviour and attitude to sexuality vary according to sex and age. The sexual reaction cycle is very uniform in men, but much more variable in women; at a more advanced age the reactions of this cycle are delayed in both sexes. While hormones have been proved to influence male sexuality, their influence on female sexuality has not been clarified. Sexual appetite changes with age. It reaches a climax earlier in men than women, but also declines more in men with increasing age. In the last three decades the number of women who masturbate has considerably increased.
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Unsafe sex in men who have sex with both men and women

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[Male and female sexuality--differences according to sex and age]

The sexual behaviors of bisexually active men, defined as men having sex with a man and a woman in previous 6 months, were compared with men who had sex with men only. Differential sexual practices associated with HIV risk between the two groups of men, as well as in the bisexual men with their male and female partners, were evaluated. Cross-sectional analyses were performed on baseline data from a prospective cohort of young gay men recruited from bars, college campuses, and a health center in Boston from to The two groups had similar levels of unprotected anal intercourse Among this cohort of men who have sex with men MSM , a sizable proportion also had vaginal sex with female partners in the previous 6 months.
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Sex and gender distinction

The distinction between sex and gender differentiates a person's sex the anatomy of an individual's reproductive system , and secondary sex characteristics from that person's gender , which can refer to either social roles based on the sex of the person gender role or personal identification of one's own gender based on an internal awareness gender identity. In ordinary speech, sex and gender are often used interchangeably. Some languages, such as German or Finnish, have no separate words for sex and gender, and the distinction has to be made through context. Sexologist John Money introduced the terminological distinction between biological sex and gender as a role in
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