That's ridiculous that anyone would find that confronting... or maybe I'm just unusual. I think it's cute.

DS 3 is still very possessive of my boobs, even though he hasn't been breastfed since he was 12 months, and when he was little and breastfeeding he would do similar things. And he still pats me there if he gets a chance. It's completely not sexual. To him it's like cuddling a comforter. That is all. What is inappropriate is other's that think it is somehow sexual. And no I don't encourage him but I don't make a big deal out of it, as he's only patting etc if he were still groping I'd probably tell him not to as I'd find it damn annoying LOL!