But at the same time, you have to know if you are sexually compatible if you are going to be making a lifelong commitment to someone. Let's not kid ourselves; sex is a very important part of a successful marriage and long-term relationships. You need to know if your partner is into some of the things that you are into sexually, and also if your libido is compatible with each other.
The good news is, you don't have to have sex with someone to know if you are compatible. After a few dates with a someone even without any sexual interactions, you both should have a general idea if you are compatible. As you advance into a relationship and each of you open up more physically and emotionally, you should have a more detailed understanding of each others likes, dislikes, and also libido levels from foreplay. If you don't then you probably aren't asking the right questions or making the right moves...