Definitely the bonobo. When I went to the sex museum in New York, part of the exhibit covered them. About 60% of their sexual interaction is between females. There were all these videos of girl chimps 69ing each other. You know how chimps can make that funny "pffft" noise with their mouths? They were doing that repeatedly in each other's bat caves. The women are dominant and spend most of the day getting themselves and others off.
From wikipedia: "Bonobo males occasionally engage in various forms of male-male genital behavior. In one form, two males hang from a tree limb face-to-face while "penis fencing""
I definitely need to try that this weekend. All I need to do is find a suitable tree and a worthy opponent.
