An older guy went to his doctor for his annual

An older guy went to his doctor for his annual physical. As part of his physical, his doctor sent him to an Urologist. When he arrives, he soon discovers, the Urologist is a knock-out, gorgeous, female doctor. 

The female doctor says to him, "Today, I'm going to check your prostate. This new procedure is a little different from what you are probably used to. I want you to lay down on your rightside, bend your knees, then while I check your prostate, take a deep breath and say, '99'." 

The old guy does as she instructed him to do and says, "99!" 

"Great!" she says. "Now, turn over onto your leftside and I'll repeat the same exam. Take a deep breath and say, '99'." 

Again, the old guy does as she instructed him to do and says, '99'. 

The doctor says to him, “Very good! Now then, I want you to lay down on your back, with your knees slightly raised. I'm going to check your prostate with this hand. With the other hand, I'll be holding onto your penis, to keep it out of the way. Now, take a deep breath and say, '99'.” 

The old guy says, "One... two… three…"