(I give a specific example here, but am also looking for how to do this with any girls I meet and then find a way to keep them in my "harem" (non-marriage) and have other girls as well, without the others getting mad even if they become aware. Maybe even have several of them at once. I am not speaking of serial monogamy, but ongoing "harem" type circles.)

There are three girls I'm interested in at my apartment. One is the hottest imo but I'd like the other two as well. How can I attempt to snag the most of them w/o causing them to get grumpy w/ my exploits? Not to mention, I also plan to start bringing other women to my apt. And if I get any of these three apartment girls, they might flip out if I'm bringing other girls and they see (it's a very open layout where there are only two ways to get to anyone's apartment.) Even if I just snagged one, she might see.

What's a player to do? I'd like to bang all three on an ongoing basis. One is the apartment manager however, should I stay away? Ie, I have to pay her the rent, but she forwards it to someone else. But if something breaks at my apt I would have to call her. She's like 19 or so.