A survey by researchers at OSU gave 62 college-age couples three separate tests pertaining to their personalities and relationship health. They found a clear correlation between those displaying "dispositional authenticity" and those reporting good, positive romantic relationships. So, what's "dispositional authenticity?" It's the ability to stay true to who you are.
Those who possess dispositional authenticity are more intimate with their partners and they also display few destructive relationship behaviors. What's interesting is that men who have this trait usually date women who are the same way. Conversely, women with this trait are no more likely to have a partner who is true to himself.
This likely explains the reason for the whole chick lit/chick flick-romantic comedy genre, huh?