Looking for a hack that allows engagement to more than one person (and to either sex)

I don't know of one for that, but there is a hack at MATY for getting married to more than one person, regardless of who you are engaged to: http://www.moreawesomethanyou.com/s...pic,8196.0.html Being married or engaged to multiple sims at once comes with a bunch of minor problems related to attraction and so forth which I am slowly fixing. I might upload the fixes some day, but there are a lot of conflicts that have to be negotiated.

I once used allmenus to make a Sim who was already engaged get engaged to a third Sim. It resulted in a lot of slapping.

What is "allmenus"? Because of the way I had been playing THREE couples living together (with "no jealousy"). one of them (married) wanted to get engaged to another. It was fun to let them sleep with whoever they wanted, and (via ACR) have babies with whoever they wanted.

I don't think you can get Sims to do an actual proposal to more than one Sim, like with the animations/special camera and all, but I think you can set "engaged" flags for the Sims in question using something like the Sim Blender. But then, if you have one Sim engaged to more than one Sim, I'm pretty sure you can't use a regular wedding arch and/or do the "wedding party" thing to have them marry all of their intendeds, if that's what you'll want to do. (For poly relationships in my game, I don't always bother with getting the involved Sims engaged, and I pretty much always use the hacked arch that kestrellyn linked to, when I use an arch at all, even for normal, monogamous marriages. So, you know, keep that in mind when considering my advice. )

http://sims.wikia.com/wiki/Game_guide:Allmenus_cheat