I wish I had something better to add but because I am "pure mono" for lack of a better word LOL, I don't see any corelletion between not wanting your partner to have either emotional or sexual connection and insecurity.
I think people naturally gravitate towards people who communicate with the same language. How we share ourselves emotionally and physically is another form of communication so it is presumably only natural to seek out people who's method of sharing themselves reflects our own. Maybe some people favour one aspect of sharing over the other because that is the aspect they most heavily value. For me they are very very intertwined so it makes things difficult to really pin down.
Playing the Game of Life with Monopoly rules.
Monogamy might just be in my genes
Poly Events All Over