WHY IS SEX FUN?

Why are humans one of the few species to have sex in private? Why do humans have
sex any day of the month or year, including when the female is pregnant, beyond
her reproductive years, or between her fertile cycles? Why are human females on
e of the few mammals to go through menopause? Human sexuality seems normal to us
but it is bizarre by the standards of other animals. Jared Diamond argues that
our strange sex lives were as crucial to our rise to human status as were our la
rge brains. He also describes the battle of the sexes in the human and animal wo
rld over parental care, and why sex differences in the genetic value of parental
care provide a biological basis for the all-too-familiar different attitudes of
men and women towards extramarital sex.