How adult? Let’s just say that nothing is off the table. So it should come as no surprise that indie games can often have some pretty adult themes. For indie developers, any publicity is good publicity. For most developers not named Rockstar, that just means a lot of hassle, conservative boycotts, and lost sales. They could include a naked villager or a lurid 'adult' scene here and there, but then they’ll have to deal with the negative attention such a stunt would generate. When it comes to including mature content in games, larger, more established developers have a bit of a problem.