According to Ask Men's annual Great Male/Female Surveys, half of all straight men say they would dump a girlfriend who got fat. 20 percent of straight women say they'd dump a boyfriend who got fat.

Silver lining: Half of straight men also think they can tell when women fake orgasms, and another half say they would be upset if they discovered their girlfriends had been faking orgasms. So, with any luck, these are all the same half of men, and when they dump their fat girlfriends, the girls respond, "All my orgasms were fake, anyway." [Ask Men, image via Shutterstock]