Extrapolating from Rel's and Eric's thoughts, you could almost work this into a general rule about first impressions and human interaction. Remember also that first impressions can happen more than once. Think about the "native son" effect - if you are a total stranger to a place, stay there a while, even as an outsider, then go away, and then come back, people are more disposed to treat you as an INSIDER returning home. Weird, huh?
The same thing or a variant could apply to a woman's first impression of whether or not her date gets lucky.