Vasectomy

A patient was waiting in a pre-op room for his vasectomy. A nurse walked in, lifted his robes, and gave him a blow job.

The patient exclaimed: "Hey, that was great, but why?"

The nurse responded: "The doctor likes your tubes to be flushed prior to the operation."

As the patient was being wheeled into the operating room, he noticed other patients masturbating. He asked the attendant why they were doing this. The attendant replied that they, too, were about to have vasectomies. The patient then inquired why he got a blow job, while they had to masturbate.

"Simple," said the attendant. "They have an HMO."