I think 314pe's agreeing with me that most people DO have conventional tastes influenced by a variety of factors including genetics, the media, and our biology.
Yes, you always get the minority interested in something odd or unusual or something most of the population would find a turnoff, but they are just that - a minority.
I guess it can be assumed most people are actually average in attractiveness, and learn to accept most people aren't supermodels and have realistic expectations (such as me), but there's still a loud minority out there that some men and women seem to come across often who have completely unrealistic ideals regarding attractiveness that no average person can meet.
If you want to relate unrealistic expectations regarding attractiveness to '20% of men get 80% of women', well, most attractive people in the media are unrealistic to achieve and only a tiny minority of people ever achieve such looks without hiring expensive nutritionists, stylists, etc. and they might have great success getting many women as they live up to the minority of women with unrealistic expectations tastes.