Gel,

Completely see what you are saying that it is about control But I still feel the jealousy issue would spill over into the sex thing maybe after the fact.
I have never known someone to be jealous of someone having a good time yet okay with that person talking or being with someone else. But I have known peoples whos spouses are okay with there mate going out and having a good time but jealous if another male/female engages in a conversation with them while out.
I keep thinking there is more to this sitch myself. But that is just me and my thoughts.