BG I find it really offensive too - in fact more like a violation of my personal space and body. Get this, my Mum rubbed my bump a few weeks back, I was giving her a hug goodbye and she just went for it and I have never felt sooooooo invaded ever before. I think because it was unexpected, it didn't really help either. It was just plain weird. So i can't imagine what I'll do if some random person I hardly know tries to!!!
Lolly x