Bob

Bob is leaning against a fence, looking thoughtful, when John approaches him.
"You know what, John?" says Bob. "I laid the pipes to every house on this road, but they don't call me Bob The Plumber, do they?"
"Er, no, I guess they don't" replies John.
"I also did the electrics in every house on this road, and yet no one calls me Bob The Electrician, do they?" he continues.
"No, I've never heard anyone call you that," replies John with a shrug.
"And yet," continues Bob, perplexed, "I have sex with one pig..."