I'm really surprised by the number of "what did the women expect??" comments in this thread, but I'm glad there are a few smart, well-spoken, good folks in here too. Groping strangers is inappropriate in any public environment; I can't image how it would feel for a woman at a tech conference. It's already a weird feeling to be outnumbered by so many men. You wonder if they consider you a part of their peer group. Getting groped by one of them would be an obvious signal that you're not.