The pig man did his homework.
It was not recent. While we do have a common ancestor with chimps, five million years ago, we come after the Bonomo split from the chimps.
That is our closer line, our Mother Line, known for having sex, anyway with anyone. The Chimps slut shamed them.
The three orders of life. Those you can eat, those who will eat you, and those somewhat like you.
Pigs going after roots, would turn up things they could not catch, but Bonomos could.
Everyone down on all fours, some mounting would be expected, at least by the Bonomo girls.
Now both these lines are five million years closer to the original Mammal.
A female cross would be back bred by the entire Bonomo group. It is what they do.
Something made the Third Chimpanze very different than the first two.