OK weird observation, how can your wife come home and make love to you when she is looking elsewhere? My wife said the cheating woke her up, made her horny...she actually justified stuff saying I should be glad her interest in other guys makes her want to have sex with me...you might be in the same boat. Hey! your chocolate is in my peanut butter...
Actually, this is more common than you think . . .
Yes, it is. I was guilty of this myself. You feel sexual- your partner about who you are fantasizing about isn't around so you love the one you're with.