First of all, it is not sex, you must not call it that. It is making love. There is a secret to it, and I am going to tell it to you now.
You must withhold stimulation. Enter her only slightly, then withdraw. Wait until she is mad with desire, begging you to penetrate. Then, then a bit more.. but withdraw again. Then you must wait and withhold until she demands it, and even then you give her nothing! Then all you have to do is touch her and she will explode.
And that my son is the art of making love.
Blame space is Louis CK's dad confirmed.