The “Sex Jokes Lite” application is clever/manipulative about their ratings. They push people to give 5 star reviews with this little bit of a social contract: in their app-description they say,

“IMPORTANT: If you think the jokes are TOO dirty, please give a 1-star review. If you want them dirtier, give a 5-star review. This way we know what direction to take in the upcoming updates !”

–Dan Grigsby

Clever, but a bit of a dirty trick *rimshot*.