The rule is if your girlfriend wants to fuck another guy, you have to let her. You are not allowed to deny her the greater pleasure another man can give her.
So-so not staged. Love the natural reactions she exudes. Especially so the look she gives at the 2:18 minute mark as if to say "OH MY GOD! How can this possibly be feeling so euphoric when, by rights, it shouldn't seeing the sensation is being brought on by someone other than my husband."