Girl on girl while married?

So I've always been attracted to girls. Lately I've been discovering my fantasies and thats probably number one. The problem is that im married and I wouldn't feel very confortable with him touching her. Is it bad that i just want him to watch?? How would i bring it up?? I feel like i would have a lot of fantasies and would be open to try many things. But i feel like he might not be ok with it..