Health

How often do people have sex?

Australians report having sex once or twice a week, on average. For Brits, it's less than once a week, while Americans report having sex two to three times a week.

Health

Anatomy may be key to female orgasm

(HealthDay)—Despite what's often portrayed in movies and on TV, most women can't orgasm with penetration alone during sexual intercourse.

Health

Why science says you should have more sex

On a health kick? Forget the juice cleanse—there is scientific evidence that a loving relationship and sex can be good for your wellbeing.

Oncology & Cancer

Men face higher risk of cancers linked to oral sex

Men are twice as likely as women to get cancer of the mouth and throat linked to the human papillomavirus, or HPV, one of the most common sexually transmitted infections, researchers say.

Psychology & Psychiatry

More porn, worse erectile function

A study has shown that the amount of porn a man watches is linked to worse erectile function. Watching porn is also associated with greater dissatisfaction with "normal" sex, with only 65% of respondents rating sex with a ...

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Sex

In biology, sex is a process of combining and mixing genetic traits, often resulting in the specialization of organisms into male and female types (or sexes). Sexual reproduction involves combining specialized cells (gametes) to form offspring that inherit traits from both parents. Gametes can be identical in form and function (known as isogametes), but in many cases an asymmetry has evolved such that two sex-specific types of gametes (heterogametes) exist: male gametes are small, motile, and optimized to transport their genetic information over a distance, while female gametes are large, non-motile and contain the nutrients necessary for the early development of the young organism.

An organism's sex is defined by the gametes it produces: males produce male gametes (spermatozoa, or sperm) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic. Frequently, physical differences are associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.

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