10. The Talk
At some point, you're going to have to talk about sex. Nobody wants to. But you gotta. And how you talk about it might just inform hundreds of intimate moments down the line, so you both had better be as honest as you can possibly muster. If he's secretly hoping there's a French-maid costume in your shared future, or your interest in 50 Shades of Grey goes beyond writing a book report, and neither of you checks to make sure the other is on board, you're going to end up two not-so-secretly disappointed creatures.