From an article entitled "Relationship rules you should break"

"Think getting down too soon is a deal breaker? It might be time to think again, says Greer. "If you feel good about the person, are really attracted to them, and you feel safe with them, it's OK to go ahead and sleep with them," she says. "On the flip side, you can also wait until past the third date." In other words, wait until you're ready, whenever that may be. View our complete list of the best white dress looks from the red carpet."

   Honestly, having sex at all before marriage should be a hard and fast rule.  Anything else cheapens relationships and reduces the chances of fidelity during marriage.  Oh, don't believe in marriage?  Well, that should be an attitude you change.