Mmmmm, head soup.

Ok sorry I am going to be blunt. The problem is you have too many lovers... a side effect from being just too damn hot! Best thing to do is tell them all there will be changes because you fell in love with a cookie monster. They will understand.

Ok kidding aside (except for the hot part)...

"they didn't know each other, for the most part"

I think the politics are very complicate when you have lovers that don't know each other. Otherwise they easily become insecure and suspicious of "the other" because they know "the other" has no vested interest in them. I think it's best for all lovers to know and like each other. I think new lover should be introduced right at the beginning before the relationship gets serious, preferably to one lover at a time, and see if they can get along... at best hit it off. Ideally it's best to have lovers with enough compatibility that they can all be put in a room together, and will interact with each other, without you having to run around to put out fires. If you have lovers you know are not compatible with each other, then I think the best thing to do is keep them separate, but expect more maintenance.

Oh the slings and arrows one must endure in the tangled web we weave. I remember one birthday party that ended with one lover sulking in the kitchen, another one leaving too early, and the potential lover finding someone else to make out with (on the couch, in front of me, on my birthday no less!) Holy crap what a night, but I survived and the relationships endured in one form or another.

My part tip is: Be as graceful as possible, be gracious and welcoming, honor your word, make solid appointments, and flirt with everyone. =) You can't control the situation but you are in charge of how you will react.