I think this can happen on either end. My fiance sort of did this when he had his heart broken from a relationship long before we knew each other. Everybody handles things like this differently.Plus, the teens start wearing makeup, looking all sexy[ewww] and they attract older guys - and thus, those older guys may play them, and things like that. So, then the giirl gets her heart-broken, and can't stir away, so thus, she starts "not giving a fuck", and starts acting up because she got crushed - do you think is true, or false? I'd love to hear your opinion on this one as well.
There are a lot of double standards that are held for relationships and/or sex though, and unfortunately I think that has to be taught to children based on the experiences they will likely have.
For instance, my mother taught me about sex when I was about 7, but when I was about to enter Jr. High was when she explained the more societal influences of it. I.e. Peer pressure, the illusion of 'maturity' it creates, but also the way straight (cis)men are expected to handle it as opposed to anybody else. She also gave me pepper spray that same day, and told me to never go anywhere with out it. Soon afterwards I started taking BC even though I didn't plan to be sexually active anytime soon.
She never tried to tell me not to have sex, or that it was wrong to have sex, or anything like that. Instead she taught me how to be prepared, and what to expect. I think that probably made a huge difference, because it didn't become a 'forbidden fruit' of sorts.
She also taught me about drinking and drugs the same way. Now, as always, everybody is different, and not everybody will handle things like this the same way. But I do think that teaching people how to handle a situation is generally better than trying to hide the fact that it can happen at all, because then when they do find out about it...well, again, 'forbidden fruit' factor comes into play.
The girl in this video clearly ended up with the idea that having sex translated to being independent or mature - and while one's sexuality can be strongly connected to this, and the mere fact that she has had a lot of sex is not something I think should be shamed or spat on, it is very clear she has some very large misunderstandings on what having sex actually means. It means she's had sex, and that's it.