Opinions on nocturnal penile tumescence

Here you have a list of opinions about nocturnal penile tumescence and you can also give us your opinion about it.
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In the image below, you can see a graph with the evolution of the times that people look for nocturnal penile tumescence. And below it, you can see how many pieces of news have been created about nocturnal penile tumescence in the last years.
Thanks to this graph, we can see the interest nocturnal penile tumescence has and the evolution of its popularity.

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