Marriage is about being compatible with your partner in all ramifications and sex isn't excluded, many marriages have failed because they chose sex after marriage and found out later that they don't compliment each other on bed. You should be able to know your partner's capabilities if they can withstand your sexual behaviors and the things that attracts you sexually before you go into marriage fully, I would always choose to know intimacy with my partner so that I don't regret getting married and finding out later that my supposed partner is not up to my expectations on bed.