Some of the previous posts made me laugh. Like others have stated it's so individual. You can generalize but the range is huge. If your ever wondering about your new gf well you simply will never truly know... with some exceptions. Many have been in long term relationships etc etc. Although these days as mentioned many need to be with someone to feel wanted etc. So they may have had 10 different bf's upto 23 so that is likely about 10 partners/bfs. I would say an average is about 4-10. The predominent range being 1-15. But of course there are many who are well above 15 and a tiny few still at 0.
Just cos a girl goes out lots means nothing. But yeah if she parties every week... especially in a drug/mad/party environment her number is likely to move up through the years. Even if you have a decent sort of girl she may sleep with 2-6 per year so if she starts at 18 that figure is likely to reach double figures at a fairly low age.
I find many sleep around when they first move away and go to uni. Generalizing it mainly happens in the first year or 2 then they realize it's not the way to be and they are gaining a rep so they calm down and stay with the one person. But again everyone is different.
The person who said no one wants to go with fat girls is totally wrong about that. Sure you and me don't want to. Each to the own but I just think when someone is grossly overweight it shows many negative things about them (many exceptions). But I guess the same could be said for many people who are the complete opposite... people who always try to better themselves and look great all the time tend to be the most insecure. I had many mates who go with very fat ugly girls (or just ugly girls) cos to them they are easy targets... usually the later in the night (and the drunker) the lower their requirements become.
Just cos a girl is stunning and gets more attention doesn't mean anything imo. Most of that attention will be ego boosting but also rude and not gonna result in her getting with the fella who has just yelled something from across the bar. Looks to equal alot though. You could be a complete prick but very goodlooking and you will get more girls then a decent fella who is average looking. If anything I would say more average/decent looking girls would sleep around more (variety of reasons). The main reason being men find them more attainable. Stunning girls get lots of attention but apart from a few exceptions most fella who approach them are drunken ugly blokes with no chance.
In my experience many of the really slutty dressed pretty girls (out in hotpants and a small top) tend to be nothing like they portray. You get them back and most get shy on you. Many of the quiet pretty student types have turned out to be the complete whores who want to be punished etc
I have known quite a few strippers too and it's mad how many are really decent girls who don't sleep about. But of course the others make their average skyrocket. That cos of the party/coke/party live they tend to lead and the offers that sometimes come their way.
Sorry for the essay. Just carried on writing (bored). Anyway I would say a common range of 4-10! Common range probably being about 60% of girls. With an average being about 6.