Sadomasochists:

Let’s say a person is over 35 years old. The sexual response has become quicker and more intense and orgasms are much more frequent than in the past. This person also initiates sex more often than in the past. This person:

The hormonal explanation of gender differences in sexuality rests on the findings that _____ is related to sexual behavior.

A major reason why Chlamydia goes undiagnosed and untreated, especially among women, is because:

Luke complains of small, painful bumps or blisters on his genitals. These are symptoms of:

The blood test that detects the presence of antibodies to HIV is the:

A transsexual who is attracted to females would be classified as:

With regard to masturbation, studies have shown that:

The first step in the gender-reassignment process is:

According to the NHSLS, about _____ of women report that they always have an orgasm with their partner.