I think that at best is exceedingly shallow. Not that anyone should or shouldn't be worried about getting intimate before then. If you are worried about someone just wanting intimacy then you should be able to tell before 5 dates. If you can't, then you shouldn't just give in without knowing. Waiting 5 dates is like saying, "I will be intimate with you after you have spent X amount of money on me." If a 5 date rule is something you want for yourself then hey go for it, but you certainly do not have to tell the other party, in fact, it would probably be wise not to.