Sex before marriage. Most religious people are not permitted to engage in it, but most of them do anyways. Some people say it's fun, others say it's immoral. It's considered a grave sin in
Christianity, Judaism, and
Islam. In some countries, it is punishable by
death (Primarily muslim countries) but in most developed countries, it's perfectly legal.
James: I waited until marriage to have sex, so as
soon as my wife saw how small my dick was, she divorced me
Joe: Damn
dude, why didn't you just show her?
James: I'm a Christian and we can't have premarital sex