New York officials were red-faced on Friday after they discovered that clothing ads on city buses that appeared to promote reading suggested a love of books could be rewarded with oral sex. The ads that ran on about 200 buses across the city in recent months carried posters displaying a suggestively posed woman in hot pants kneeling among a pile of books beside the snappy slogan "Read Books, Get Brain." What unhip, unsuspecting local transportation officials did not know was that "get brain" is street slang for oral sex.