What is adult? According to ratings boards and hand-wringing politicians, the only qualifications necessary are a bucket of blood, a stream of foul profanity and a parade of naughty lady parts. Ironically, the very things that are included to win over immature teenage boys. The following games, however, define adult in a different way. They tackle challenging themes, explore intellectual ideas and deal with complex characters in complicated relationships. They add shades of grey to an otherwise black-and-white form of entertainment.

Here are the best adult games you can get your hands on. Steam has gotten plenty of steamy and sexy games that leave little to the imagination. Starting off our list of sexy and adult Steam games, we have HuniePop — a dating sim puzzle game. This game has always stood out for some of its explicit moments, although it does come with some pretty challenging puzzles as well.

There are party games and video games and mind games, and then there are good, romp-in-the-bed sex games. These games inject some excitement into a relationship, and they are not as lazy as a simple game of "Truth or Dare" that you'll inevitably quit after two rounds, because it's boring. Don't get us started on "Never Have I Ever.