I think it is unfair to say girls act like sluts, without also saying guys act like sluts. I'm not a feminist or anything, but that is a double standard I can't stand. The reality is though, Girls sleep around and it is okay to consider them easy or sluts because of it. Guys sleep around and they make a list and compare. Somehow, sleeping around for them is expected, and making such lists is a sign of masculinity.
It's all in the old idealisms. Women were valued as virgins, men weren't. It's because there were no paternity tests and back then paternity was everything. That's what it comes down to. Times have changed for the most part, and women are trying to get away from the whole 'you're only valuable if you're pure' thing. It's a work in progress.
As for sex being abused, it depends on your beliefs. If you are old fashioned, then maybe it is. If you change with the times, it is just something you can enjoy. Sex isn't valued by many due to the fact that many don't see the point. It was valued in old times because there was a chance that a baby could be born (pre-birth control days). It isn't as valued today because there is birth control available.
Yes, there is still the 'doing it with the right person' and 'the doing it for love', thing... But many people haven't met that person, or have loved. I guess what I'm trying to say is, it is all moving with the times.