Well, maybe DLD is into Tantra or Tao sex.

One of the central theses of these methods is to differentiate between orgasm and ejaculation. The dry orgasm (which iirc some here have experienced incidentally without having intentionally aimed at it) allows you to go on and on without losing your erection and to orgasm several times. There are several techniques to accomplish the dry orgasm by redirecting the bio-electric energy that is produced during arousal from your genitals to your whole body, thus enabling you to get full body orgasms (this may also happen to some people incidentally during very intense non-tantric sex sessions).
In this line of thought sperm should be preserved as often as possible to save the nutrients contained in it and to avoid the exhaustion that usually sets in after ejaculation.
Interesting stuff, guys. I'm just reading a book about it.
PS: this is not a joke, though my long shot at DLD's Tantra expertise may be. Depends on his answer.rofl