Guy here. Reading your post made me think of a past relationship I was in. I met this girl and she was amazing, we clicked right off the bat. Normally, just like in your experience, sex occurs on the 2nd or 3rd date, but she made me wait. Everything was going great, like really really good! I felt we were on pace for me to make her my one until we had sex. I can't tell you how incompatible we were. It got so bad I went to the doctor to get Viagra thinking I was suffering from ED at 27 and still nothing! We broke up a month or so after our first attempt. It's a shame because I still think about her and often think how different my life would have been. Moral of the story, have sex with the girl before you decide on marrying her. I'm pretty sure your religious convictions won't approve of a divorce when the relationship turns south.