New research shows that variation in mating behaviors, parental care and differences in ornamentation of the sexes in bird species is driven by demographics rather than vice versa. An international ...

In the late ‘60s and early ‘70s, when “sleeping with someone was almost like shaking hands,” womanizers had a certain allure, according to Norris Church Mailer in her charming new memoir A Ticket to ...

Nature often surprises us, much to our delight. In a research project, a biologist follows a standard set of steps: observing a pattern in nature, devising a hypothesis to explain that pattern, and ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. LAST FEB. 11, A FORMER ARKANSAS STATE employee named Paula Jones called ...

Promiscuity mixes up the gene pool and dilutes genetic differences between populations, slowing down the evolution of new species, says new research by an international team led by the University of ...

NEW YORK (CBS 2)-- A new study suggests there may be a biological reason for infidelity. A group of New York researchers say it's all in the genes -- and not your blue ones. When it comes to monogamy, ...

Females are coy and males are ardent. This was Darwin’s somewhat Victorian portrayal of the sexes in his book The Descent of Man and Selection in Relation to Sex. The myth that males are naturally ...