"They also have sex for pleasure but most of the time, it's a way of making peace. They are a bit the hippies of the forest."

Bonobos.

It's feeding time at the sanctuary, and with the distribution of papayas, bananas, sugar cane and other delicacies for the 43 residents, the excitement mounts; loud screams and, in front of the visitors' curious eyes, simulated sex.

"Do they do this all the time?" asked one surprised Tanzanian official.

"Only to relieve tensions and when negotiating for a perch or food, and then disinterestedly, whatever the sex or the age," said Andre.

Yes, you remember what it was like when you had hippies over to your last dinner party.