I do fantasize about gangbang sort of situations, they seem awesome in my head, but in reality I'll probably never do that because I can't imagine how I'd do it safely.
he has permission to fuck other girls as long as it's me he always comes home to.
Bingo!
The real life problem of gangbang, and actually harlem/reverse gangbang as well, is when you have a difference in numbers (3 to 1 or more), the single is going to lose control within a short time. Even a simple MFF 3P could easily get ugly for the guy if the two girls are comfortable with each other and gang up on the guy. For a MMF 3P I suppose jealousy between the two guys plus the natural advantage that a girl can easily take two cocks at the same time, will make things more manageable for the girl. Once you have 3 guys on 1 girl, it's probably gonna get out of control before you know it (getting splattered in places you don't like).
You know once I play it out in my head, the advantage for a girl is huge. An orgasm takes a lot of stamina out of an average guy, so even in 1 vs 4, the girl can fairly easily
calm down most or all the guys by making each of them cum. Say you get on top of one guy and ride him hard, if you know that motion you can milk him in about 2-3 minutes. At the same time grab a hold of another cock and jerk him off, also a sub-5-minute challenge. Then the remaining two guys... there's a chance they are clear-headed and notice what you are doing, otherwise, they may get easily pwned by you in the same fashion. Even if not, with the first two guys take a break to recover, you can still take no. 3 up the pussy while blow the last guy. Status GREEN: situation under control. Further, making a guy cum twice within 15 minutes will pretty much knock him out for the session, so a gangbang only get nasty for a girl if more than 2 guys managed to delay/control his ejaculation.
But consider a 3 vs. 1, even if the 3 girls don't gang up and be mean to the guy, he will struggle to manage them all, assuming every person in the game are in a state of horny-ness.
OTOH the possessiveness/jealousy for either man or woman is silly and archaic. What matters in a relationship is reliability and mutual trust. And of course an understanding that both partners are each other's
primary sex partners. Which somewhat ties to another thread about dating or having a relationship with JAV performer. If one or both partners is regularly having sex with other people (under any circumstances, including purely for work) then it's kind of iffy to call it dating or a relationship. Even in an "open" relationship, if one person is having sex with other person(s) several times a week, that's pretty nuts.
Anyway, just saying you are so so right. The world is a better place if both men and women can think more like you.