Most Helpful Girl
There's just a natural aesthetic that goes with what you were born with. Women look better with feminine traits because feminine traits are defined as being inherently female, and vice versa. To go against that grain reads foreign and unnatural to most. I can't speak for everyone but I am one of the many women not attracted to feminine men.
Most Helpful Guy
Because we are a sexually dimorphic species of animal who are meant to look different and perform different biological roles. Put simply, they look ugly because it's unnatural.