I'd come across the research back when it was first released. I'm not even sure there wasn't a discussion here about it.
Being the sort of perverted individual that I am, I'd be interested to know how the rear most parts of the corpora cavernosa and the extending two crura are positioned with respect to the anus (we I did admit to being a perv). I've noticed that is some women, once they become highly aroused this area can be extremely sensitive. These anatomical diagrams would seem to suggest the link.
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Anteater, or thanks to CG "Monsieur Manger de Tante"