Monkeys in Indonesia use rocks as ‘sex toys’

Monkeys in Indonesia get their rocks off using actual rocks, supporting what’s known as the sex toy hypothesis, a new study finds.   Researchers studying long-tailed macaques (Macaca fascicularis) found that the monkeys repetitively tapped and rubbed their genitals with stones to pleasure themselves, according to the study first reported by New Scientist (opens in […]