[onan_barbarian]

If you think it's OK to just be stupid in this context you have no idea what you're talking about. If they need catharsis, I suggest they beat up a pillow while screaming about their Daddy, or their ex-wife, or whatever their major malfunction is.

It stops being 'ok' and safe when you have a bunch of idiots who don't know what they're doing. For example, when one idiot heel-hooks another idiot and idiot #2 decides to tough it out (thinking a rotational leg lock can be resisted like an armbar for a while), idiot #2 is likely going to spend some quality time with a surgeon. When idiot #3 decides that a crucifix is a perfectly good takedown response because they saw it in the UFC, idiot #4 is going to spend two weeks with a funny feeling in his neck. etc. etc... I can populate this list out to about idiot #20 or so, striking and grappling. There are a lot of bits of the human body that just don't fix themselves; worth thinking about before trying this stuff on.

As for chronic non-participant, well, I've been rolling around in the guard and the mount with other guys since 1995 (Judo, submission grappling, BJJ) without any gay panic. And I've seen my fair share of creepazoid 'fight clubs' where there's 1-2 bigger guys who are (a) rubbish grapplers and (b) strangely interested in rolling with weaker, smaller, prettier guys, so it's not such a 'cheap jab'.