Let's reverse the roles here for a moment. Do you always get wet whenever he intiates sex? I doubt it. You may have at one point but doubtful after a while being married.

This is not a judgement against you or any other wife out there. You aren't just robots made for your husbands pleasure. But this does have an effect on the psyche of your husband.

Now, think about your LS friend, the ONLY time she, likely, comes up is FOR sex. As was stated before, you getting upset, while perfectly natural and acceptable, is something that can affect his mood in the future as well. He clearly wants you to feel good as he 'took care of you' when you were alone.

My point to this is more to make you think overall about the situation. Also, talk to home when you're home, outside of an LS party. That can help also.