HunieCam Studio [Steam store page]
It seems like a lot of people like this game, but it's average at best, with the quality declining the more time you spend playing it. Basically it's a shallow clicker game, which surprised me since the store page seems to imply a bit more strategy and management.

Instead it just tries to keep you occupied clicking a handful of different buildings instead of adding any real depth. I'm sure you can optimize it slightly to get a higher score, but there aren't even semi-deep strategy or mechanics here.

As a side note, this game is tagged 'Nudity', but does not contain any as far as I can tell - unlike other games like HuniePop from the same creator.

Grand Theft Auto III [Steam store page]
The first 3D third person sandbox game in the series. Unfortunately only a hint of a story, so after a few minutes roaming around and a couple missions it lost my interest. I found Just Cause 2 to be a much more compelling sandbox game