http://siteinsights.com/2008/04/18/e...-really-arent/

So without further delay the top eleven words that sound dirty but really aren’t:

1. hump day
2. seamen
3. fish taco
4. thespian (done already)
5. kumquat
6. Ballcock
7. rectory
8. the penal system
9. Uranus
10. Bangkok
11. angina

I don’t care how old you get Uranus jokes are classic…

*****************************************

Found a couple:

titillating
Ball mount (trailer hitch)
Homo Erectus
uvula
Cock-up (Great Britain - NA it's "Screw-up", a noun)
plethora
dickcissel
phacometer (apparently the "a" is pronounced like a "u" )