An active sex life is important to couples’ happiness, and those who make love once a week are happiest, a new study suggests.

An active sex life is important to couples’ happiness, but they don’t have to go at it like rabbits — those who make love once a week are happiest, a new study suggests. More frequent sex isn’t a buzzkill for a relationship. It just doesn’t pack the same punch, Canadian researchers report Nov. 18

Sexual intercourse (or coitus or copulation) is principally the insertion and thrusting of the penis, usually when erect, into the vagina for sexual pleasure, reproduction, or both.

Background Antiretroviral preexposure prophylaxis is a promising approach for preventing human immunodeficiency virus type 1 (HIV-1) infection in heterosexual populations.

Heterosexuality is romantic attraction, sexual attraction or sexual behavior between persons of the opposite sex or gender.As a sexual orientation, heterosexuality is “an enduring pattern of emotional, romantic, and/or sexual attractions” to persons of the opposite sex; it “also refers to a person’s sense of identity based on those attractions

The previous study, HPTN 052, established in 2011 that the efficacy of antiretroviral therapy at reducing HIV transmission from the HIV-positive partner to the HIV-negative one was at least 96% in heterosexual couples, but had too few gay couples in it to establish if the same applied to them (or rather to anal sex).

Question What is the risk of HIV transmission through condomless sex from an HIV-positive person taking suppressive ART?. Findings In this observational study in HIV-serodifferent heterosexual and MSM couples having ongoing condomless sex over 1238 couple-years of follow-up, there were no cases of within-couple HIV transmission …

Jun 10, 2008 · After Vermont legalized same-sex civil unions in 2000, researchers surveyed nearly 1,000 couples, including same-sex couples and their heterosexual …

How long couples in lasting relationships should wait to start having sex, according to science

Yet Another Survey Shows That LGBT Domestic Rates Are The Same As Heterosexual Couples