Professor Franz de Waal svarar på läsarfrågor:
Q: Do promiscuous gay men and bonobos have anything in common?
A: Bonobos often engage in sex with same-sex partners, but they’re not gay in that they also have sex with the opposite sex. They’re ‘bi.’ They seek sex often for social reasons, to reduce tensions, and to form friendships. I am not sure that this also applies to human gay promiscuity, or whether the latter is purely pleasure-oriented.”