If you liked
Colorful
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...then you might like
Panty & Stocking with Garterbelt
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Both animes have no plot at all and revolve purely around Penis Humor. Colorfuls focus is more on men and their misadventures when trying to take a peak, while Panty & Stocking is focusing more on spoofing other series. But still the kind of humor in both series is the same.