I can see why women make men wait. Hell, I was doing that even if I like someone a lot. The thing is, men is all about conquest. When you make them wait, you're actually making acheiving the box now their focus on conquering. With that comes anticipation, the usual feeling of the cat & mouse game. The waiting game can be both good and bad.
When I met my husband, I gave it up the first night after our date. Feelings were already developed and we clicked almost instantly. Giving it to him didn't deter him for asking for my hand 10 months later.