Oh my god, if you listen to Viper, you're gonna become a priest. Just follow your heart AND your brain, let things fall into place. I've been going out with the same girl for 5 years now and every time i see her it's like falling in love for the first time all over again. Sex is an important part of a relationship, if you don't think it is, ask the guy who's not getting any. Sex can bring you closer together, pre-marital or not. So yes and no to your question. Sex has nothing to do with puppy love but for anything more than that, it's vital.