Every reader comes to you with a different background, you try to work with them as best you can. Some will never 'get' your cleverness or nuanced prose. Just be sure they still understand and are interested in the tale you weave.
Yes!! Make it up. A personal variation on Gaelic seems particularly appropriate. Whilst writing smut/erotica one need not shy away from calling a pussy or prick exactly what it is in common parlance you seem to have strayed into erotic fantasy; I think in this case a more exotic vocabulary might add to the story. No I'm not suggesting you break out a medical dictionary to introduce clinical terminology. I'm thinking you want to be more fanciful than that.
As for the Feminine Point of View, I for one think you did a fairly good job; But then I'm a guy so what do I know.
Mad