That depends on the man. Personally, I'm with her because I want her, not a bunch of other sexual paretners. What is sad is that people today think sex is a recreational thing and don't respect themselves enough to know the difference. Bottom line, why have an SO if you want to sleep with everybody else. Also, what diseases might she bring home to you? I don't care if she says they all wwear condoms, how do you know, you weren't there. God forbid she gets pregnant. Are you supposed to support and take care of some strangers baby? Think this through. Don't do it just because you want her.
No, I really don't think I would do it. If it is she and I having sex, and someone else besides me, to me that would be weird. I know a lady who lived like that for awhile and she had 2-3 partners at one time. She was confused and I didn't agree with it. (I was NOT one of the partners. LOL)
meh... I've done this a few times... but find the girl asks for it (to be open)-then gets upset when you actually DO IT and see other people... when it (open relationship) was HER idea. lol a bit ridiculous.