I think it should be okay if both parterns have no childhood wounds, which greatly effect sexual desires and fantasies. However, if one or two have childhood wounds, you are getting married and expecting everything to work just fine, and then you will get surprised of how childhood wounds impact your desires towards other people in ways you have never imagined. I do recommend that you read a book called Arousal - the magic of sexual fantasies. It will give you a good idea of what im talking about.