Unless you are gay or bi, how are you able to judge the quality of men?
The concept of Beauty is divorced from sexuality. Otherwise people would try to fuck the Sistine Chapel.
Beauty is about appreciating what is superlative in a thing. If I show you a beautiful man and ask you if he is beautiful, I suppose you could not answer me with a simple yes or no? You cannot judge?
You cannot have an opinion of his beauty because to acknowledge it would be to shine a light on your lack of sexual confidence as a man. No one is asking you to get on your knees take him in your mouth. It is a simple question.
But, the real question is, what are you afraid of?
"Create like a god, command like a king, work like a slave."