I know a guy who makes women wait a long, long time. It might even be three months. It might be longer. I'll have to check my blog. LOL But anyway, his problem was that he'd once managed to impregnate a woman about whom he deeply cared. He believed that love was mutual, until she got pregnant. She told him she was going to carry to term, and then, after he was already emotionally invested in their baby, she terminated. He's never recovered. He feels that things would never have gotten so far with her if he'd not been sexual with her so quickly. He feels that he'd have seen her more clearly, sooner, if he hadn' been sleeping with her. I wouldn't say we weren't physical, though. The make-outs were awesome. There was also the one time he fngered me to orgasm, and I stroked him until he made me stop and go home. I asked him if I could blow him, and he almost let me...
Anyway, while we were waiting, we discovered some serious incompatibilities and stopped seeing each other romantically. I wish we could have had sex anyway. Still, maybe he's right. We would have had incredible sex, if we'd had sex. Maybe we'd have let the great sex keep us together longer than neccesarry. I've certainly seen it happen to other people.
IMO - the 90 day rule, that doesn't always work. For one thing I'm impatient and I may not feel like wasting 3 months on a guy who I later find out doesn't like the same "cookies" I do. :wink: 
