"If you go into a marriage with the idea that you already know everything about each other and that no major changes are allowed, that seems to be a recipe for disappointment. If you've already created space and capacity in your relationship for dealing with change, even when it may be troubling, the timing of when you begin to learn about yourselves as a sexual couple seems less important."
Sex educator Cori Silverberg lays out four issues to consider when deciding whether to wait until marriage to become sexually active. Totally worth the read if this question is ever on your mind! Also check out his post on managing expectations of wedding night sex.