Many people mistakenly assume that sexual role is linked to body type—that smaller, more "effeminate" men are bottoms, and larger, more "masculine" men are tops. A 2013 study even suggested that people could guess a gay man's sexual role from their face at a rate "better than chance," but this method relies on and reinforces harmful stereotypes. In reality, as therapists and sexual health experts point out, the "1-0" labels are a significant oversimplification of individual desire and preference, which is a far more complex and personal matter.