Maybe often true, but there are exceptions. I have a pair of nieces who are very attractive and don't primp excessively. However, their main cosmetic focus is thinning the unibrows they would naturally have... and I mean bushy straight across. I don't blame them a bit.
Unfortunately, in the interests of family harmony, there will be no pics offered as proof.
Obviously squirrel visors are an exception. I was of course speaking in generalities.