Why are self reported studies less scientific? The notion that "science" only happens in lab settings with controlled experiments is completely naive.
Self reporting is the basis of a significant part of modern medicine, and the entire basis for most research regarding mental health, pain, and, yes, sex.
And keep in mind that no study is ever intended to be the final word on anything. The fact that a study is not the absolute most perfect study ever does not preclude it from being valid and making a contribution.
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