People use religion as a crutch and a coping mechanism. It's just natural, humans HAVE to know things, so people cling to religions as a way to not have to fear death. Religions aren't brainwashing groups ran by crazed power hungry people (well...as a whole, Catholicism is a different story) the people truly have the power. If they wanna follow some one else interpretations, that's their own decision. Some people do use the bible as a loose guideline and consider themselves Christians, but that's the difference between Evangelicals and others.

I don't see why sex should be considered in marriage anyway, but that's my personal opinion, sex just doesn't interest me that much. Overrated as...overrated things.