A man goes in for a colonoscopy
The man gets undressed and the doctor says, "I can't believe I'm about to say this, and it is certainly unprofessional, but I have to say that you have the most perfect ass I've seen in my entire life! You should be proud!"
The man awkwardly responds, "thanks?"
The doctor continues, "mind if I numb it a bit before the procedure?"
Man says, "uhh, okay?"
The doctor takes a deep breath, leans in, puts his face between the man's butt cheeks and goes, "num num num num num."