She thinks you want to sleep with other women.
She doesn't understand why you have this fantasy.
She thinks the idea is weird.
She is uncomfortable with the idea in general.
She doesn't understand how or why you would want to share her.
She doesn't think you really love her because you want to share her.
She said it's fun to think about but she would never do it in reality.
She's afraid other people will find out.
She said your children were an obstacle for some reason.
She doesn't feel good enough about herself physically or mentally to want to do it.
She's objected on religious grounds.
She thinks it's cheating.
She's worried you won't like her if she did it.
She's worried about liking it too much.
She's worried about not liking it at all.
She's worried one or both of you will regret it.
She doesn't think it's possible due to logistical reasons (when would it happen, how, where, etc)
She said she needs an emotional connection with people before having sex with them.
She said it wouldn't be healthy for the relationship.
She's worried something can go wrong (i.e. what if she falls for the other guy).
If any of these sound familiar, and you haven't been able to get past your wife's objections to make your fantasy happen, then this webpage is for you!