For me, the best technique is to actually imagine the boner going down. If you think of random rubbish then it'll just stay there, oblivious to your anguish. But if you concentrate on the image and feeling of it going down, it'll start to go.
And don't let anything touch it. For the love of god, don't move, because your trousers will rustle against it, or something like that. And you'll never get rid of it.
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