Are top characters in BL always drawn attractively?

Have you ever thought why in BL the top characters always so attractive, like they always have the most ideal looking visual in men. Meanwhile, that's not always the case for the bottoms. I've seen a lot of bottom characters that considered not as attractive or plain-looking. And even if the bottom was supposed to be the most beautiful man in their universe, the top is still very decent looking. I think I never see an ugly top or is there....???