Probably the best way I can think of is to arrange for him to "accidentally" see this website. If you don't like his reaction, he obviously isn't good enough for your treasures.
If you initially get no reaction, you could bait him by asking if he thinks that's sexy because you do.
If he passes the test, you could then, if you so choose the lush garden of unspeakable pleasure that awaits him if he plays his cards right.
By the way, which one is the closest to you, If you don't mind me asking.