Our happy hour fact to amaze your drinking buddies with.

Bar RafaeliBeing in the presence of an attractive woman sends a man's stress levels to dangerous heights.

Researchers at Spain's University of Valencia paid 84 male college students about $20 to participate in an experiment, which they were told would involve solving sudoku puzzles. That, however, was cover to have the guy spend five minutes alone in a room with a pretty woman, who presumably was also there to do sudokus.

The subjects' levels of cortisol, a hormone released in response to stress, was tested before and after the interaction. The researchers conclude that, when in the presence of a desirable female, the average male's production of cortisol shoots up by roughly the same amount as it would if he were in the process of jumping from an airplane.

Short, extreme bursts of cortisol can be bad for the heart. Chronic exposure can lead to adult diabetes and impotency.

So even if you overcome your trepidation and get the hottie, things aren't looking good for you.