You can fall in true love at a young age, i mean, shes 17 so imo she's practicly an adult. In america u have to be 21 to drink alcohol and i guess thats when you guys think your grown up. But down here you have to be 18 and 16 to legally screw. I think you guys have it the wrong way around, anyway yea, it is very possible. If 2 people are looking for the same things, someone to love and someone to love them and comfort them. 2 people forget all about they're problems when they're together and always feel safe and like nothing else matters, and when you care for someone this much you know its love because you've never felt about a person like this before. If you both bond together and you enjoy each others company and u both need the same thing, then i think that it could get very seroius, no matter what the age. Sex is just a plus like kizazz83 said. Its something a couple does together to bond and to show each other how much the relationship means, having sex and then cuddling and talking for hours and just enjoying each others company is love in my HONEST opinion. enjoying each others company so much you don't care about the sex, your just glad your with them and EVERY time your not with them, you feel lonley. That is what love is.

lol, sorry for all the spellin mistakes and if that made no sense. Im pretty baked and its hard to think right now.

P.S: oh shit i just got beer everywhere...