The objective in Super Strip Fighter IV isn't necessarily simply to beat your enemy. Sometimes, it's something else entirely.
Created by doujin circle Studio S, Super Strip Fighter IV is an 18-years-old-and-up "parody" fighting game that has 15 brawlers in skimpy outfits (and one big fat geek) duke it out. The game makes knowing nods to fighting games besides Street Fighter like The King of Fighters, Tekken, Virtua Fighter and more.
Each character has their own special abilities. Take Rana, who is covered in massage oil, which she uses to rub herself on rival fighters and slip past their punches. Or Jin Tendoh, the otaku, who carries a bag of otaku goods he can throw and a vibrator he can vibrate. The "finishing movies", ahem, are... yeah.
スーパーストリップファイターIV [Studio S NSFW]