I’ve been in relationships where we had sex quite early on (like within the first week of becoming interested in one another)... then as weeks and months went by, we started to find out we weren’t really all that compatible as far as our values, personalities, interests, etc. ... but because the sex was so good, we were under the false impression that if the sex is so good then there must be something good about the relationship and that’s why the sex is so good... so we held on... for way longer than we should have, based only on sexual attraction, which as we all know, is something very shallow to base a relationship on. That’s why I always caution not to have sex too early in a relationship, because sex can blind you. I don’t put a quantitative amount to when you should have sex but I do say, have sex once you know that the sex isn’t going to be the only thing sustaining your relationship.