Panties of Legend

From the introduction: The Panties of Legend are mysterious underwear of unknown origin. Only a handful of the panties are known to exist (and if the phrase "handful of the panties" excites you, you're playing the right game). When you sublimate sexual urges, your panties charge up like an overwrought metaphor for burgeoning sexuality, granting you superhuman Powers. Nothing can stop you when your panties are magical... except for your Rivals.