Beat Angel Escalayer

A Hentai Eroge by Alice Soft that was adapted into a three episode anime series produced by the studio Pink Pineapple.

Sayuka, the main heroine, who is tasked with saving the world, has abilities that are powered by what's called a "doki doki dynamo", which is recharged by sexual arousal, and this powers her Magical Girl ability to turn into an "Escalayer". You can see where this is going. The game and series consist mainly of a Monster Of The Week format accompanied by severe Hentai overtones. There exists an English dub of the series, but no localization of the game yet.

Beat Angel Escalayer provides examples of

 * Alien Invasion
 * Beta Test Baddie: FM77
 * Cloning Blues: FM77 is supposed to be a clone of Sayuka.
 * Intimate Healing: Of the "sex to recharge energy" type.
 * Mad Scientist: Dr. Arc.
 * Magical Girl
 * Meganekko: Sayuka in civilian form
 * Multiple Endings
 * Naughty Tentacles
 * The Punishment: If you lose battles, Sayuka gets raped, but since having sex ups her stats, it's not exactly the smartest thing the monster can do.
 * Ridiculously Human Robot: Madoka
 * She Is All Grown Up: Sayuka and Kyouhei used to be neighbors when they were little.
 * Spiritual Successor: The later game Beat Blades Haruka has a more interactive battle system and more heroines to manage, but is essentially Escalayer with ninjas instead of aliens.
 * Unlucky Childhood Friend}/Victorious Childhood Friend: Sayuka, depending on which ending the player gets.
 * You Lose At Two Peace Points
 * Youtube Poop: Beat out Bible Black as the number-one Hentai used.