The discovery of homosexual Japanese monkeys is providing a fundamental and uncomfortable challenge to one of Charles Darwin's basic evolutionary theories...
Japanese macaques -- monkeys slightly smaller than chimpanzees ..."We've got females that are competing for males with other females, we've got males that are being choosy, males that are sexually coercing females ... we've got females sexually harassing males that don't want to copulate with them, we've got females that have sex with each other, we've got females that are competing with males for other females, we have females that are mounting males."... "it's common for females to masturbate with their tails" where there is no direct genital contact.
"The traditional evolutionary theory says you do things in order to reproduce," he said, "so why would you do all this non-reproductive sex?

EurekAlert, DC - 16 Feb 2003... University of Texas-Austin will address the tenuous path linking genetic sex ... Lethbridge will discuss his research on homosexual behavior among female Japanese macaques...