There's a male bonobo that's actually missing the tip of his penis because buttocks), testicle touching and even sometimes “penis fencing”.
The bonobo also historically called the pygmy chimpanzee and less often, the dwarf or gracile .. non-human analogue of frotting, engaged in by some human males, two bonobo males hang from a tree limb face-to-face while penis fencing.
Penis fencing is a mating behavior engaged in by many species of flatworm, such as to homosexual activity between two males among bonobos; same-sex genital-genital rubbing is used in bonobo society to cement bonds, reduce conflict.
Despite the frequency of sex, the bonobos rate of reproduction in the . They also practice so-called penis-fencing, in which two males hang.