what would you do?

Tell them you lied about ever having sex and you just wanted to sound cool although you would NEVER do it out of wedlock.

That would just make things worse, most likely they wouldn't even believe him and they would trust him even less for trying to lie about it. I honestly don't see what the problem is if they're using protection, they're both 17 so it's legal, parents are just stupid.

Sneak out at night and do her.

Sure you don't see a problem. However, they are parents and parents think about things in an entirely seperate fashion. He's not in a position to raise a family if an accident were to occur. He would have to limit his potential and perhaps lower his lifetime earnings by a signifigant percentage. That, in itself, would make the rest of his life harder .

Also there's the whole social aspect. Although it's not as much of a taboo thing now, when they were growing up it probably meant you were a slut if you were pregnant at a young age. If they're a religious group they don't want their son's sins coming out to haunt them.

Which is why I said "I honestly don't see what the problem is if they're using protection." There are grown couples that can't afford a kid that have protected sex and there's no problem with that, there shouldn't be a problem with them doing the same thing at 17. If they are being safe, that's the best they can do besides not doing anything at all and that's all that can be expected of them. Once me and Nikki get our own place in a couple of months, I can assure you that we aren't going to wait until we are financially able to take care of a kid before we have sex.

It may be unrealistic but it's the truth. Even with preparation accidents do occur. Anyways, not saying that's what I recommend or anything I was just giving a less popular point-of-view .

I say wait it out for a bit and then see where it goes. Trying to get them to change their minds so soon is not a good idea. Let it dial down a few then casual ask to go to a movie with her. Try and stay public places, where you wont be having sex, and they will regain some trust. Soon, have her come over while your parents are home and soon enough, they will leave you too alone.

Dial down? Oh, man. I just busted a nut laughing.