Apparently this thread is being brought to you by Sesame Street.
There's probably a cut-off point at which the age and number just don't seem "right". I mean... 70+ partners at 23... that just seems like a lot. It's not a judgment, but... it *feels* like a lot of people for that age.
Granted, though, if you think of the pure number, if she'd been having sex since maybe 17, that's one partner a month (70 partners/6 years= ~12 per year). If actively dating, that's really not that outlandish an accomplishment (especially for a female).
(of course that's nothing like the best friend of a good friend of mine, both chicks, whose number was "over 200" by her own enthusiastic admission and had been having sex for only 3 years at the time)
As for me, I can't honestly say the number is meaningless. Of course, I wouldn't ask until well into a relationship, because THEN it wouldn't matter to my brain/ego.
I'm not saying she has to be a virgin or have had only one or two before me, I'm saying there's an upper limit that's just going to make me feel uncomfortable. Would I date a girl who hit 70 when she was 23? Probably, because I likely wouldn't find that out until after hearing such news would no longer make any difference. It's not my business "how many".