SerenityValley
Surgically happy.
plus what they share probably isn't so devastatingly embarassing (at least in their minds) as it is for us women. For a woman to admit she has an eating problem, to admit that we've eaten in secret etc etc ...
I won't tell you what has happened in our group, but can promise that it isn't any easier for us men to admit. I've admitted things in my group that previously only my very closest friends know. And then there is the whole "bravado" thing that men are supposed to be strong, unemotional, and it really hamstrings us. It's probably why LL don't really do much for men - shorter groups (which always start late in ours, because the woman's group overruns by up to half an hour).
I think the main thing here is that men get an open group and women get a closed group - so right from the off ee get used to how it's done for us. If women's groups were always like men's, then I don't think there would be as much anxiety about change.
I can see huge benefits to both approaches but I think you hit the nail on the head - men's groups are open, because there are fewer men doing it (it almost seems socially unacceptable for a man to diet, or admit he has an issue).