if it was bad.
But in most cases sex actually helps the relationship along.
But in my experiences in my bachelor days, all I cared about was getting laid. So once I got it, I would see the game often but I wouldn't really commit unless she was awesome. No sex would actually risk messing the relationship up, because you might come off as a girl that is playing games. Make sure regardless to invest in the relationship, meet him, show your interest. Then the whole sex thing won't be an issue if you don't want to mess around until date 4 or 10.