Male macaque monkeys "pay" for sex with female macaques by engaging in grooming before doing the deed, reports New Scientist. "On average, females had sex 1.5 times per hour, but immediately after being groomed by a male partner, this rate jumped to 3.5 times per hour. After grooming, the female was also less likely to offer herself to males other than her grooming partner." This, of course, is in stark contrast to human females, who often enjoy grooming males...instead of sex. (Yeah, we would know!) [New Scientist, Salon]