This one is pretty obvious;
Cockland, starring the Italian Stallion
Lord of the Cockring
Willie Whackoff and the Great Ass Penetrator
…'s the only one I could think of on the spur of the moment.
O Brothel, Where Art Thou?
Still more Shakesporn:
The Merchant of Penis
As You Lick It
The Taming of the Screw
King Leer
Cumbeline
The Two Nubile Kinsmen
The Merry Whores of Windsor
and the aforementioned Much Ado About Humping
How about:
Desperately Sucking Susan
Beverly Hills Cock
Glad-He-Ate-Her
**Apussylips Now
When Harry Meats Sally
Back in Stella’s Groove**
The Hung-Like-an-Elephant Man
Bi-SEX-Tenial Man
Manos: the Hands of Vibrate
More Shakesporn…
Julius Seize Her
The Temptress
Love’s Labour’s Lust
Tony and Cleo
The Whore House Rules
My Left Testicle
Pork-A-Hot-Ass
The Slutty Professor
Bill & Ted’s Bogus Orgy
A Clockwork Dildo
Lust in Space
I Know Who You Did Last Summer
As for already-dirty titles, I’m surprised nobody mentioned “Dick” or “Blow”.