I have to disagree with you. Sexual activity and emotional love and commitment are not tied together. In my eyes Sexual activity is just "scratching an itch." My mindset on cheating is...having your significant other that you are emotionally attached to and invested in here, and having someone else over there who you are also emotionally attached to and invested in. That would be cheating.
Having your significant other that you are emotionally attached to and invested in here, and having sex with someone else over there, that's not cheating.
Now I have told my wife that if she has some itch or desire that I will not or cannot satisfy, go out get your itch scratched and come back home.
I can honestly say that the idea of her being serviced by another man does not turn me on. But she is welcome to pursue her pleasure as she sees fit, as am i.