Anyways going to the Bonobo ....it is the only mammal (other than humans) that engages in homosexual behavior regularly. In other animals (eg lil puppies, colts , some simian species etc) they will occasionally seem to mount each other (and sometimes actually mount) but this is usually among the young animals that just had a flash of mating instinct. It never lasts.
However the Bonobos seem to have developed that crazy stuff to a whole other level ....and if you read the post i placed (no. 5) you will notice the manner in which Bonobos engage in homosexual sex (and even the way they perfrom heterosexual sex).
Those apes are just ape!
Even among human lesbians i doubt they normally have sex the way Bonobos do .....at least not with one standing up and lifting the other! To refresh your memory on Bonobo lesbian sex here is part of the post: As for the homosexual behavior the Female Bonobos engage in genito-genital rubbing (or GG rubbing) between adult females. One female facing another clings with arms and legs to a partner that, standing on both hands and feet, lifts her off the ground. The two females then rub their genital swellings laterally together, emitting grins and squeals that probably reflect orgasmic experiences
I do not know what is up with Bonobos, but they sure are strange!