The<unk>  is a test used to evaluate nocturnal erections in a workup of male impotence. A length of connected<unk><unk> s connected by perforations that allow easy tearing are secured loosely around the male's flaccid penis just prior to sleeping. If the perforated connections between the individual<unk> s are torn upon awakening, this is taken as evidence of nocturnal tumescence. However, there is also a chance that the male may shift his position in bed in such a way as to unknowingly tear the perforated connections between the<unk> s without having achieved a nocturnal erection, thus causing a false positive.
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