Seriously? We need an excuse, for that. Of all things.
And what's with all these guy's obsession with tits, and playing with tits? Why, I even hear tell there's women that also enjoy playing with tits.
It's.
Pussy.
If I had to hazard a guess, i'd say that it might be instinctual mating behavior, like dogs sniffing each other's butts. "Oh, it's you."