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The only thing I dislike about wearing Speedo's is the cold water shrinkage thing. But my best mate at high school had the opposite problem. He used to reckon that cold water got him hard. He was a SpeedoGuy, he always had a good bulge and a good size flaccid in the hot showers afterwords. For that and other reasons which I won't bore you with I had no reason to doubt the his claims, although a lot of the time I think it was more of a semi than a true stiffy.
I've never met another guy who gets hard from being cold but I've found net statements from guys on other forums along the lines of "Cold showers make me hard".
So I'm thinking can we train ourselves to do this because I wanna be as big when I come out of the sea as I was when I went in.

I don`t know if you can train yourself. Iam like you in cold water and a speedo, but if I skinnydip in cold water I am hard immediatly! I guess that is more the risk and excitement rather than the cold water though!

The same thing happens to me when I go skinnydipping in the sea, If I stay in there to long I come out with a semi hard on