No matter your particular preferences between the sheets, sexual behavior is unbelievably complex. All that goes into sex, happens during it, and can happen as a result can make for many questions for those who are curious. While some of this pondering may be purely entertaining, learning about sex can also be a meaningful endeavor. "Studying sex is important because our sexual lives affect our health, our relationships and marriages, and our general happiness," says Debby Herbenick, associate professor at Indiana University and author of The Coregasm Workout. "It's an important part of being human — not all the time, but for most of us at different points in life."