If you liked the Kamen no Maid Guy manga, the Anime-Planet community thinks you'd like:
One hot summer day, the perverted Kakeru decides to cool down by reading a new porn magazine and having a can of soda – but little did he know that the can would transform into a cute girl named Melon! As she has a decent body, Kakeru decides that Melon can stay at his house and even attend his school; but soon their lives change with the arrival of a government official. He informs the pair of the 'Akikan Elect,' a war between steel and aluminum cans, in which Melon must fight. While initially hesitant to partake in battle, the appearance of a rival can and her mutual hatred of the opposite metal persuades Melon otherwise. With both Melon and Kakeru’s safety on the line, is the pair really prepared for what it means to be a part of the Akikan Elect?
If you like ecchi, then you've come to the right place because Akikan and Kamen no Maid Guy are brimming with it. Both series have pretty ridiculous storylines (though Akikan wins the award for least plausible plot of the century, but are deal if you want some perverted, no-nonsense fun.