Depends on how close they are. The ones I've known for say 5+ years I wouldn't, because I'd eventually end up hurting them and I wouldn't be able to do that (the ones I actually care about.) Plus they know what I'm about, so they will stay the fack away from me lol. The girls I've met in the last 6 months yes, I bounce between them. It's quite simple though.
You know how it goes. You go out with some friends. Bringing female friends is a plus because your target, will see you with females and will think "oh good, there's woman hanging around him, he can't be a total loser/creep etc." Do you thing and by the end of the night you bed them, you leave your number and if they phone you back, you know you are sorted. Once you've done that, you've established that next time (if you decide there to be a next time) you both know what the climax of the evening will be (pun intended

). Don't ever phone a chick the next day. Sending the wrong signals.
After a year, I had a long list of who I could phone. There was no need to acquire new targets. Just go out and enjoy yourselves. Phone them and allow them to join you. They became friends, but the foundation was sex. You know you've achieved something great when you go home with 2 of em together and they cool with that.