If you get to watch the uncencored version, it is overtly sexual in basically every episode. No woman is left clothed by the end of season 2 and if that's what your looking for you won't be disappointed.
What made me laugh is the fact that these teens power up by being groped in some way, their breast, their bum, their arm pits licked?
Over all its not a bad story, but not a new story. There a variations of this theme all over the anime world, but then they do call it fan service for a reason.