The ability to get boners - and not semi-hard
but good, rock hard, solid ones
And don't hide it behind a hand.
Let it all hang out for a proper inspection.
If you are intact (still have a foreskin), he should ask if it can skin back properly with ease. And he should inspect the head.
Your balls should get a serious once-over.
The flow of your piss should be asked about; a weak or strong stream when you take a whizz.
The strength of flow is an indicator of prostate health. Were you aware that good whizz flow can indicate good cum power?
Remember, this is Men's Health Month. Get that check-up. And make sure everything behind the zipper gets properly checked.
Or at least talked about.