Anyway, I've been noticing recurring instances of unintentional anatomical misinformation and/or abuse.
First, many authors (hell, many people in general) seem to be under the impression there's a "thick vein" running along the underside of a penis. Now, I've never been the proud owner of penis, except when I've held a man in thrall (usually for the amount of time it took him to get off), and I've never been a medical student, but I had begun to suspect some time ago that this dense tubular structure was not, in fact, a vein.
Nagged by doubt, I looked into it (well, not literally).
Then there are lips. No, not netherlips. They're in m/f erotic romance, and I haven't read any in years (in part because of phrases like netherlips). I mean the lips that ring a person's mouth.
As a result, I've declared a moratorium on lip-biting in my own books -- unless, of course, one character is doing it to another. But no more self-cannibalism!
So what body parts in romance fiction have you seen mislabeled, ill-treated, or behaving in strange ways? I seem to have become hyper-aware of this stuff, but I'm hoping it will teach me some lessons. 'Cause I'm sure I've been guilty too!