FEMALE gorillas get friskier when their silverback has sex with another female, even when they themselves cannot conceive. The finding suggests they use sex to gain an advantage over competing females.
and colleagues at Zoo Atlanta in Georgia totted up how often four captive female gorillas invited sex or copulated over two years. With only one male around, females could not have been trying to confuse him about his paternity, one commonly offered explanation for non-reproductive sex. Instead, even pregnant or lactating females solicited more sex on days when other females were sexually active (American Journal of Primatology…
