Don't you think your time would be better spent reevaluating your marriage? You're only 21 -- a 1-night stand is going to satisfy you and keep you on cloud nine for how long? A month? You've got the rest of your lifetime to spend with a partner who can/should make you feel like that all the time.

What if you and your friend's husband fall in love with each other? Won't you feel just a little bit bad about how your short-term need impacted her future?