Wait. I know this is an unpopular answer these days, but that's what I did and I have no regrets. My wife and I knew how to talk through things, including sex, that helped us understand compatibility in that area, and if you date someone long enough to decide you're ready to get married, it's pretty easy to know whether you're a right fit or not. Marry based on compatibility with each others personality first and foremost, sex will naturally follow. Also, sex is for making babies, so unless you're prepared to have one dont do it. And trust me, that's one of the biggest burdens you will ever carry, very rewarding if you want it as my wife and I did, but very hard to do right and much easier when two are there to help each other. Children flourish better in stable homes where mom and dad are both present, look at the studies, there are tons of them.