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Human sexual activity, human sexual practice or human sexual behaviour is the manner in .. (See Prevalence of virginity.) The first sexual act of a child or adolescent is sometimes referred to as the sexualization of the child, and may be considered as a.

Another significant distinction can be made between what medical statisticians call incidence and prevalence.

How widespread is physical or sexual violence against women? What groups of women have a higher prevalence of this type of violence?.

Condom use at last higher-risk sex is the percentage of young men and partners is important even in countries where HIV prevalence is low.

Measuring the prevalence of various sexual orientations is difficult because there is The class of people with same-sex desires may be larger than the class of.