The Sexual Avenger (Book #1) by Matthew Vaughn

Trevor is sick of being abused and humiliated by his large and disgusting wife. He seeks the help of the one man who might be able to save him, The Sexual Avenger. Using his Dong of justice, The Sexual Avenger steps up to the plate to help this poor soul, but, has he meet his match when he comes face to face with Pam the Ham? 

Justice is coming, and it's coming hard.