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Voluntary and involuntary erections

The possibility of an erection is a concern often cited by males who are apprehensive of social nudity, but pracitioneers do not consider that fear to be warranted. They note that an erection is very rare in social nudity, affecting around 1% of the adult male population. Men may feel more self-conscious at first, and therefore less likely to be aroused. Then, after being accustomed to social nudity, they would come to view it as natural and non-sexual.

Source from : http://en.wikipedia.org/wiki