As a reader, I hate being jarred out of a particularly hot scene by tekky terms. However, I understand the want of using them in some instances. "For the Potion Master's Amusement" by Snape_Submiss uses slightly technical terms (pubis, penis, labia, etc.) and comes off as extremely hot, BUT! it fits within the context of the style. It's fetish, and fetish requires one to know exactly where and what is going on, with crazy amounts of control. So, that was appropriate in a modern piece.
Regardless of that argument, if I'm reading fluffy, and I see words like "uterus" or "prepuce", I've lost the rhythm--and I'm all about rhythm and cadence in stories. Just to throw in a devil's advocate, I tend to loosen up the yoke on words like "labia" and "perineum".
As a writer? All those arguments become applied and become an ouroboros of struggle. *shrugs*