When going out and picking up girls, how often do you guys pick up girls that are below your standards to end a slump?

As shallow as it sounds I don't usually approach a girl that is less than a 7. On occasion though, if a girl approaches me or I meet her online I will let her personality raise her levels to me. I find that it doesn't last because my physical attraction may wain even if she's amazing in the sack.

Does this happen to you guys? What are your thoughts on slump busters?