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Sex differences in brain and behavior of animals including humans result from an interaction between biological and environmental influences Adult sex ratio, life history, social organization, sexual selection, parental care, sex roles This is also true for the differences between men and women concerning sexual orientation

Animals that mate with the same sex

Blink and you might miss dolphins having sex This article is part of the themed issue ‘adult sex ratios and reproductive decisions Only mammals have a clitoris, yet the benefit is not readily apparent in all animals

Unlike many species, humans can enjoy sex at times other than ovulation

Also, we have an exciting way to top off the event, called a climax. A large number of morphological, physiological and behavioural traits are differentially expressed by males and females in all vertebrates including humans These sex differences, sometimes, reflect the different hormonal environment of the adults, but.