It's often a case that a man doesn't become aware of how vulnerable girls are in society until he has a daughter of his own, at which point he becomes the most protective person in the universe. Often, what he wants for his daughter the least of all is for her to end up dating someone like him when she's old enough! He might also have to learn some new habits, too.
Very manly men have probably never painted their nails or had their own painted. Their daughters don't really know or care too much about that, though. They want to play beauty salon today, and if mom isn't around, then dad will have to do. There's no point fighting against it; you might as well just look at it as learning a new skill.