Facial symmetry is considered one measure of beauty. Interestingly, when the attractiveness was lopsided, relationships weren't as successful when the woman was significantly more attractive than the man. The downside of dating a beauty like Angelina Jolie or Julia Roberts is apparent to Billy Bob Thornton and Lyle Lovett, and now it seems obvious to everyone else. The researchers hypothesized that attractive women possessed the confidence to end a bad relationship earlier, rather than let it run its course. Less attractive women "may have to make do with what they have, hence the longer relationships," said researcher Rob Burriss. A more attractive male mate had no bearing on the relationship length, interestingly, but the more attractive female mate cut the relationship length to a matter of months, as researchers reported in the journal Personality and Social Psychology Bulletin.