I encountered the word "penetralia" the other day in a vintage cartoon.  Meaning the "innermost things" and "hidden place," it makes for a poetically sexy euphemism.  I shared it with erotica author Jeremy Edwards, who tossed off two limericks using the word:

A sea captain's fine genitalia
Delighted his mate's penetralia.
He implored, "Leave it in!"
So they stayed skin to skin
All the way from Peru to Australia.

A foppish young gent of Westphalia
Was costumed in so much regalia,
He took hours to unwrap.
And one needed a map
To discover the man's penetralia.