The story's original and there's a lot of potential for sexiness, especially with domination and submission through consensual fighting. Unfortunately, it doesn't feel like much of the BDSM content lives up to what it teases, being absent throughout the game except in the aftermath of a loss when its more or less a single page of text that summarizes, "You haven't had so much as a sexual thought throughout the entire game because your life is all about fighting, but you just lost a fight. Now, you're getting fucked, and your fighting career is over. Maybe there's some mention of you orgasming. Regardless, your story ends here."
However, the biggest problem with Fight Club Reborn is that it tries too many plot lines and too many game mechanics, and on the wrong engine. There's enough randomness to the fight rolls that you can win or lose fights when you don't deserve it. There are enough choices which don't hint at their consequences and which don't become relevant until much later in the game. This, combined with the game's many branches and the game's frustrating html engine, leads to a lot of wasted time backtracking and save scumming just to see the story--as lacking as is sex scenes are.
Overall, some novel ideas and some hard work in this game, but it's lacking in execution and identity.