Sounds completely bizarre, but true.
My 10 month old girl cat, since she was 12 weeks old, has had an obsession with nipples. If you aren't paying attention, she is down your top before you know it, and will try and latch onto your nipples. And she isn't discerning about who's nipples she goes for either!
She once tried to latch on to my boyfriends mole... she mistook it for a nipple 
Anyone know other cats with the same crazy problem?! I've had loads of cats, and non have ever tried to breastfeed off me before! 