relationship question, help please?

Okay. so me and my girlfriend have been dating a year in september, I love her with all my heart, and I know that I want to be with her for the rest of my life, but her dad hates me and doesn't want us to be together, because in his view two girls being together is wrong, and he tells her that we're gonna go to Hell and all that stuff for being together, when in my opinion, if we're goin' to Hell it's going to be for doin' something wrong, not finding happiness with a girl. But anyways back to my question, So I've heard that makes a couple stronger, and they grow closer on a more personal level, because it's shared between you and the person that means something to you, and well, I've been thinking that maybe having with her would bring us closer together, and at this very moment, we need to be as close as possible, because they're doing everything to get us to stop talking...He's bringing the cops into it. (Me and my girlfriend are both of legal age to have consensual in the state we live in and we're only a 1 and 1/2 apart so the cops couldn't do anything if we did anything ual) We've talked about having before and she's said she would want to because it'd be another way for her to show me how much she loves me, and she's kinda sorta wanted to for a long time, Oka. So I'm 15, and she's 16 almost 17, do you think that's too young for us to be having ual relations, or is it okay seems how we've been together so long and don't plan on breaking up. I just want to be as close to her as possible, and I'm pretty sure sex will help with that, but then again I'm not sure because I've never done it...what do you guys think? Should we have sex or not?