This is part of the joy of being rich enough to be able to own a fine slave like this! Normally a handsome, fir, strong, muscular man in his prime would be out chasing women, or happily married in the suburbs with a wife and kids. Even if he did like sex with other men he’d be “cruising” guys like himself at his gym and in bars. There’s no way he’d want to display himself to older, out of condition men however wealthy they were.
But as a slave he has no choice. The harsh training he received when first enslaved has taught him that only pain and suffering awaits him if he fails to please his owner. He works and works to keep himself in perfect condition and waits, attentive and submissive, for his owner’s command. He knows his owner likes to see him naked and eager to please, and so keels before him. He understands that his role is to please, and so soon he will be in his owner’s bed, using his superb body to satisfy his owner, completely focused on his owner’s satisfaction and utterly suppressing his own thoughts about how a man should have sex.