Again, "bonding" in this kind of research absolutely doesn't mean the promiscuity is excluded. See my other comment for link.

Note that you just discarded a honest sex act of a dog as just "rubbing genitals"? So when is a sex act sex act and when it's "just rubbing"? Is licking genitals, what dogs do, a sexual act? Was Clinton actually right, what he had with Monica was not even sexual?