Ever wonder why you find your gaze lingering dreamily on a guy giving his little girl a piggyback ride or laughing at something adorable she just told him? Turns out we’re attracted to dads thanks to a biological assumption that the man is healthy enough to procreate. Because he’s already had a relationship that resulted in offspring, we have very real evidence that another woman pre-vetted him and decided his genetic material was superior enough to pass on. The bonus to listening to your biological assumption? Dads -the good ones – tend to have desirable personality traits, such as patience, kindness and the ability to be selfless due to having to care for someone else.