I think it depends on the situation. My first serious boyfriend I waited a month or so, if memory serves. With my husband, however, we slept together on the 1st date and literally weren't apart from each other for 2 weeks after (we're disgusting). We've been together 2 1/2 years now and going strong. So, it just depends on the guy, & what you want - relationship? fling? one-night-stand?
Every guy and every situation is different - you try to set restraints on any act of intimacy and you're just going to screw things up (no pun intended). Just let things happen naturally.
