Well, most girls will start their sexual activity at teens. I did, and I was therefore fully aware my daughters would likely do the same. It is normal for a developing adolescent girl to accentuate her body in a sexual way, it is what would be biologically expected as she will have the impulse to advertise she is becoming ready for reproduction. It is biology, whether we like it or not. Girls at that age are hardwired to like guys feeling attracted to them, so they will show what boys like.
I made it a point to educate them about safe sex, risk of pregnancy, etc, throughout their childhood. I also decided I would come to grips with how they would dress and what they would do with their boyfriends as long as it was along what I would find acceptable now that I am their mom and they know better.
So I let them dress attractively but not overly slutty. They knew I would provide condoms and birth control if they decided to start sex. They also knew that their friends would be subjected to screening to make sure they did not get involved with someone who would be a risk to themselves (by being a criminal, a thug, or a lowlife). And finally, that I would allow them to have sex here in their own home if the person was right. My oldest daughter is 16 and I am glad she followed through with our advice, she knows how to care for herself very well and has a decent boyfriend, so we allow her to have sex in her room if she wants to. I know no one really wants to know their baby is having sex, but I would rather know with whom and that she is safe, and that is why I allowed her to have sex at home.
You are not being a hypocrite. It's normal, you were a teen too and now you are going to teach your kids what you learned from it and hope they follow your advice.