This sounds extraordinary. We went to a party last night and we are good friends with the couples we went with. We always hug and mwah when we meet, men and women (well, the men don't mwah) but while two of the women were up dancing I was sitting chatting with one of their partners - and we have danced with other people's partners - but if we had gone round the corner for private arrangements, that would be completely out of order. I would certainly not expect my OH to have people licking him and drooling over him - it's certainly an issue of boundaries of decent behaviour. If his relationship with this girl as part of his friends' group is non-negotiable, then you will have to think again, otherwise you will be looking over your shoulder all the time. You don't need that. Go find a nice guy who has friends but who has his priorities in the right places.