Fap while taking a Nitrogen bath.
The coldness will condense your body, making you harder. It has to be nitrogen though, or else there isn't enough cold to make a noticeable impact on performance.
[spoiler]It's like fapping in snow, but instead it's liquid nitrogen[/spoiler]
[edit] I'm surprised this didn't shake more heads...
Year two players, what've you got to say on the subjct?
[spoiler]ayy ninjas, no CoC has been violated, this has been around for six months. You had your chance to remove it.[/spoiler]
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Sit on hand, wait till hand is numb, jack off, pretend someone else is doing it to you.