A man goes into his doctor feeling really nervous

A man goes into his doctor feeling really nervous

He asks his doctor "can you keep a secret?" The doctor replies "Yes I can, doctor patient confidentiality."

The man looks around to make sure nobody can hear him, then he whispers to the doctor "Between you and me, there are five testicles in this room."

The doctor looks at him with a blank expression, then replies "So, you're telling me you only have one?"