I believe the answer to that question depends on what you are looking for. If you are looking for a relationship and you meet someone special I have always been one to feel as though the best way to go about it is to abstain from sex for at least a month, but the longer the better..... to an extent, of course. It keeps things simpler.
If your just having fun, and so is your partner, so long as your using condoms every single time, have fun with all the Mr. Right Now until your Mr. Right comes around.