Some American Manga fans will know of American artist Adam Warren's endlessly brilliant take on these oldschool Anime characters. His version of Dirty Pair was published by Dark horse comics in 6 separate series, and his style brought a lovely intelligence and satire to an otherwise vapid franchise.
Kei & Yuri are peacekeeping government called the Worlds Works and Welfare Association, or 3WA. They always manage to get the mission completed, but cause wanton havoc along the way... this is how they get their nickname "The Dirty Pair." This is not hentai (which is a crime), Kei & Yuri are just doers of dirty deeds.
I recommend other anime's that have cute sexy strong women that does non-stop action: (Gunslinger Girl, Cutey Honey, Najica Blitz, Noir, Burst Angel, Slayers, Shadow Skill, Kekko Kamen, Sailor Moon, Neo Ranga, Mezzo, Iria, Ghost in the Shell, Armitage, Moeyo Ken, Read or Die, Battle Angel, Kaleido Star, Kino's Journey, Miami Guns, Gunsmith Cats, Revolutionary Girl Utena, Kiddy Grade, Debutante Detective Corps).