You can have an amazing relationship with someone regardless if you have sex or not, but you can not say that sex will not play a factor sooner or later. You do not want to marry someone only to find out later that the sex is bad and neither of you like it. Many divorces happen just because they don't feel that intimate connection. If you want a truly happy marriage, you need to know you can connect on a more intimate level than just enjoying each others company.
I know that there are so many people who will say that having sex is okay if you're in love. That is so wrong! The bible is 100% accurate. And the bible says to wait until marriage. Some may say "I am going to marry him anyway." Well if you're going to marry, he/she should love you enough to wait. And that is that