Here is a freshly handcrafted meme that I think would be exactly what a guy like you is looking for. Each male and female can explore sexuality freely. Each male can have 3 wives and each female can have 3 husbands. All together as one extended family that supports each other no matter what. You can opt out and get a divorce at any time too.

I am the jealous type. So it would not work well for me, but I do find this marriage concept truly fascinating.