If you're 17 now, it wont be long before you're 18. Get a job ASAP, save up money, and get her to do the same. When you can afford it, you two should get an apartment together or something. Once you and her are both 18 there's not shit they can do besides kick you out for seeing each other.
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.
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.