Beer goggles is a phenomenon in which one's consumption of alcohol makes physically unattractive persons appear beautiful. Scientists have understood the science of beer goggles. They say that a symmetrical face is seen as a sign of good genes and good health. Similarly studies show that drunk people find it more difficulty to tell if a face is symmetrical.
Even low dose of alcohol increases self-confidence, sexual desire and the appetite for sociability. The main reason behind control of impulses is the prefrontal cortex. Additionally, higher the BAC (Blood Alcohol Content) scale, the more confidence. However after .10BAC you may start to become an ugly guy.
People have between .11-20 BAC experience over-expression emotional swings. However, if beer goggles stand for one night, 20% of men have negative feelings while 80% of men carry positive feelings. But 46% of women seem to have negative feelings when experiencing beer goggles. But Beer goggles wore off more quickly for women.