I have the same feelings. I think of how it would feel to have another woman breasts in my face. To suck on their nipples. Suck each other clits. Makes me really hot. I watch female on female porn and masturbate to it. I'm in my 40's and don't know if I'll ever have the chance. Married with children myself. I had the opportunity when I was young and didn't take it.
Not all, but many guys would probably be okay with the idea of having a three-some. Now, if you are talking about being alone with another woman, that might not go over so well. As a guy, I would suggest looking into the option of a three-some, just make sure its not someone you know or will likely run into again. Reduces the temptation of cheating and/or being awkward.