Vas deferens jokes

How can you tell a man from a woman

Well, there's not really a vas deferens

Two men discuss vasectomies...

First: "I'm thinking about getting a vasectomy, but I'm worried about performance..." Second:" I had one, I was worried at first but after a while I realized there just wasn't a vas deferens"

Are the penis and the testicles the same?

No! There's a vas deferens between them!