Is it the type of KTV lounge where scantily clad women sit around with them? My husband would rather forego the boy's night out if his friends choose that type of venue. I really think it depends on the type of crowd your husband hangs out with. When my husband hangs out with his guy friends, they either go for a beer or play billiards. Very clean fun.
Well my husband's friends loves to choose those places for bachelor's night. Much as I dislike it, don't really have a choice since it's someone else's celebration. On normal days he'd better know his limits since he's a father now. Haha. Either way I think his daughter will be the one limiting his outings in future.
Personally I am okay with it - and Hubby is fine if I do the same too. I think the key here is open communication and rules about what is ok and what's not for your family lah.
If it is just for singing leisure I am totally fine. Also, make sure you know who are the friends he hang out with normally.
thanks