Suppose a buddy pointed to a couple of really heavy metal bars, and said "Hey, why don't you grab these heavy things and lift them up, put them down, repeat these steps a couple dozen times, and consequently suffer some ridiculous soreness afterwards!" If I knew nothing about weightlifting and its health benefits, I'd probably reply, "Hey, why don't you go to hell?" If, however, my buddy explained how weight-lifting strengthens bone density, burns fat, improves sleep (among so many other things), then I'd realize that the benefits outweigh the costs.
The first scenario represents our current understanding of the many "rules" of Christianity, especially as they relate to sex. The challenge of contemporary Christianity isn't simply to enumerate its rules, but to explain why they're necessary. The problem in meeting this challenge, of course, is that many Christians, themselves, have forgotten how compliance with these rules prepares one for the ineffable joy that we all seek.
