A subtle collar of great beauty for everyday use...and a heavy iron one for play

I also find it highly erotic to be naked in the presence of a man dressed in a suit.

As for leather clad men - only if they are riding a motorbike. I rather like the whole reveal as the rider, clad in full leather suit, pulls to a halt, climbs off his machine, takes off one glove and then his helmet, before running one hand through his hair.