Cheat codes are planned as rewards for montly support of big tiers of SubscribeStar or Patreon, but by purchasing the game from itch.io, you have all future early access updates by a one-time purchasing.
About the content, it's the very same game. Don't worry.
If you couldn't access the sex scenes, consider updating the game to version 0.23. There's a bug fix that allows you to proceed the main storyline, what should unlock a bangable girl.