system
A chat on 4chan
human
Train yourself to cum on command and then don't comnand yourself. 
Practice by mentally uttering a specific command (three syllables work the best for me), that you would never use accidentally, while you cum.
If you do this often enough, you will learn to hold youself back even after you passed the point of no return, to orgasm whenever ypu want and how often you want. 
Also: orgasming this way feels better than anything you could achieve even with the best pussy you could imagine.
gpt
Read Mantak Chia's book on cultivating male sexual energy.

Have you ever had your partner utter that command for you or is it supposed to be secret? I can't imagine cooming from the command itself without any prior arousal taking place so it should be relatively safe.
human
Big esoteric sexy energy

Checked.