I don’t think the OP’s spouse is way out of line, if it makes him uncomfortable that is ok and it is all right for him to request she not do it again. I do think it’s odd that he doesn’t even want her to share a bed with a straight female friend though. My girlfriends and I sometimes have girls weekends together and share one hotel room, (yes, we travel without our husbands!
)so 2 queen size beds sleep 4 of us just fine and I don’t think it would occur to anyone to object to that. It seems silly to get another room or make people sleep on the floor in that case.
If it was someone I knew well, I wouldn’t be bothered by it, gay or straight. My husband and I are close friends with several couples we have known since college, and I would feel fine with him sharing a bed with any of them, male or female, gay or straight. Now, I would make sure the other parties involved felt the same way first, that is, keep everyone informed and all is well. I might actually tease both of them about it if it happened.
My husband is friends with all the women from the couples and I am friends with the guys as well, we often do fun things together. My husband might go out grocery shopping for a vacation weekend with another wife, and I might ride a jet ski clinging to another guy. Maybe some married couples would even have a problem with that.
My husband has slept in the same bed as my best female friend before and it does not bother me. Our group of friends has often crashed at each others’ houses, and all slept very close in a single tent where “individual beds” have pretty much no meaning, and nothing has ever happened before so maybe that has something to do with it. The idea is not foreign to us. But I also trust the other people and know that they would never try anything with my husband, nor would any of the guys try anything with me, because we all respect each other and our spouses too much to do that.
I have a close gay friend that my husband also knows well, and I don’t think it would bother him if I shared a bed with him, although I would ask first (my husband and my friend’s partner) out of respect. If it was an instance of my husband sharing a bed with the friend or me, I think he would request that I do it! (Although I would not have a problem with him sleeping with the gay friend either.)
If it was someone I had never met before, I would object, but I can’t imagine my husband would ever do that. He would call me beforehand. So I guess the biggest thing to me is just to keep everyone informed and respect the boundaries of all.