Left handedness is a biomarker for preferring receptive anal sex (study of gay men) https://www.ncbi.nlm.nih.gov/pubmed/28234947# …
Is it too much to ask what works for women? 
Guess it would be very easy to check/replicate in the OKCupid data.
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Have a look when you get a chance!
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I will, if you write up the study for psycarciv.
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I have 0% of the available time required for this!
End of conversation
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