A lot of women look like crap without makeup because they wear too much makeup. It's not good for your skin to wear it 24-7. They don't all look terrible without it though
It's too feminine. ESPECIALLY eyebrows or any type of blush. Guys need to look natural for some reason. We were just born in a society that has built us to interpret masculinity that way.
I know a lot of guys who wear foundation for acne and I would have never known. Whenever I have a bad red mark or pimple I'll put a little tiny bit of foundation and it hides it pretty well... but I would never go any further than that.
Majority of animals, males are more naturally beautiful. (Look at female compared to male lions). Humans are animals and we men probably have attractiveness to lure in females.