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.

Psychology & Psychiatry

Why do men find a lower waist-to-hip ratio sexier?

Male turkeys famously will attempt to mate with a head on a stick. In fact, gobblers prize a snug snood over the whole hen. How far then can a man's ideal sexual partner be stripped?

Psychology & Psychiatry

Are women more attracted to 'dark and brooding' men?

A paper co-authored by a researcher from the University's Institute of Psychology, Health and Society states that women are generally drawn to men with dark and brooding looks. This in turn may relate to their reproductive ...

Psychology & Psychiatry

A woman's face drives relationship length: study

Men looking for a quick fling prefer women with more "feminine" facial features, said a study Friday that delved into the evolutionary determinants of the mating game.

Medical research

Skeleton regulates male fertility

Researchers at Columbia University Medical Center have discovered that the skeleton acts as a regulator of fertility in male mice through a hormone released by bone, known as osteocalcin.

Health

9/11 attacks linked to increased male baby miscarriages

Stress caused by psychological shock from the Sept. 11, 2001 terrorist attacks, felt even by people with no direct link to the event, may have led to an increase in male children being miscarried in the U.S.

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Reproductive success

Reproductive success is defined as the passing of genes onto the next generation in a way that they too can pass those genes on. In practice, this is often a tally of the number of offspring produced by an individual. A more correct definition, which incorporates inclusive fitness, is the relative production of fertile offspring by a genotype. For example, the offspring produced as a result of normal mating are an example of reproductive success, because they too can pass their genetic material on to the next generation. Alternatively, the birth of a mule as a result of the mating of a horse and a donkey is not an example of reproductive success because the mule is sterile and thus not able to continue the germ line.

Reproductive success is part of the calculation for fitness and a key element in the theories of natural selection and evolution.

This text uses material from Wikipedia, licensed under CC BY-SA