If he was being checked out by a prospective slave-owner.......

........I guess he'd sail through the examination, nothing further to be inspected. But now those days are thankfully long since become bygone and he can use that magnificent tool any way he wants, though he might have to do quite a bit of searching around before he finds a guy willing to be fucked by that thing. I know I'd have either to be pissed to the gills or be offered a handsome sum of money before I'd dare to let him take me with that up the bum.