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correlation is not causation

Posted by ruman on 05 Aug 2010 at 23:16 GMT

Importantly we show that fellatio increases the duration of copulation.

the authors have only shown that there is a correlation between fellatio and the duration of copulation

isn't it possible that it works the other way? maybe fellatio is the result of longer-duration copulation and not the cause.

for example, perhaps longer-duration copulation causes discomfort, and the female is reacting to that discomfort by providing additional lubrication.

Competing interests declared: i am employed by the public library of science in a non-editorial capacity.