Something I Found....

[Brayon]

I feel this fairly accurate for writing erotica. 

[Fae Briona]

If you want the other direction -  the most unique description for "lady bits" I've seen is in the lyrics to Damn I Wish I Was Your Lover by Sophie B Hawkins, where refers to her "jungle book".

Best one for sex is also from Hawkins (don't remember the song), where she refers to "riding his joy like a child on a merry-go-round".

[Thorn Wilde]

The simultaneously worst and best description I've ever read of sex is from The Death of Bunny Munro by Nick Cave. So as not to inadvertently break any forum rules, here's a link to a screenshot of the paragraph in question. Fair warning: awful straight sex. I am not yet convinced that Nick Cave can actually write anything other than song lyrics.