usually 1st bf ends in tears. If you ask me at 16, I'll simply refuse, and wait until university, unless I think he is husband material. Out of my 200 secondary school classmates only 2 couples got married in the end, and both guys you can already tell they were going to be good husbands. And as far as I know, they both waited til uni. And even when he wears protection, you can still get infected with other things, so is not that safe after all. From what you said, I don't think is the guy's first time, so be careful.