Sex is very important in marriage and many married friends of yours won't even tell you how it is also a struggle. Many men cannot satisfy her (quote me), some others do not know what to do between the sheets aside thrusting (closing my eyes) and worse still they think it is a taboo to ask for help. Many do not also know how to help their wives who may be the one with a sexual problem (topic for another day).
God made sex beautiful and was not ashamed to create it, yet many are struggling. As a smart man, see some of the important things you should begin to do now to enjoy sex when you get married.