I’ve often thought some words sound like they should be dirty, but they aren’t. You know, words like “extrude”, “lubricate”, “crevice”, or “congressman”. Anyone else want to add their favorite “dirty” words?
“Peak.” It just sounds dirty in so many ways.
Turgid.
Defenestrate.
These words have always sounded like they could be “dirty” to me:
Runt.
Yankee.
Bonk.
Motherfucker.
Yoyo.
Impugn.
Penal
Turbid
Masticate
Fecund
Assanine
Innuendo
Asphalt
Beattific
Plunger
Redact
Ductile
Audit
Cecil.
Work
Manager
Supervisor
Exsanguinate
Sucker
Final demand
Suppose you are spot on here mate, I mean if you were defenestrated from a 40th floor the fall would be a bit turgid and boy what a dirty mess when you grounded.
Exacerbate does it for me.
Masturbate does it for me, Salem 
Crank
Shaft
Rod
Lube
Coccyx
Pianist
Pontificate
Titillate
Uvula
Titmouse
And of course… Uranus. 
pianist
Secrete
It’s my least favorite word ever.
Moist. The Spark “What gender are you?” quiz, once upon a time, asked which word was intrinsically nastier regardless of meaning, moist or used. At the time I thought that was a really silly gender indicator, but every woman I’ve asked says “moist” and every man says “used”, except for one of the girls I know that the Spark thought was definately a guy.
Masticate.
There’s something about the word “thrust” that just sounds… dirty.
The way the English pronounce “Vivat Regina” (Long live the Queen) makes it sound like a venereal disease.
my list:
[ul]insert
penetrate
spread
spew
moist
oral
stimulate
rear
orifice
uvula
titillate
[/ul]