Genitals and self-defecation? RoX, it is 100% a kid friendly game. But the "creativity" in the game certainly lends to the types of drawings like PewDiePie had.
I'm sure some will, simple people have simple pleasures and any should enjoy the game anyway they like but you are endorsing a video with mature content through a game that is marketed to everyone and everyone (which includes kids) that own the game, now are linked to a video that is not suitable for everyone. We're fine for people to enjoy the game however they like, and I'm sure Steam users will get it a kick of his review.
Kids? Nah, I don't need that yet as I'm too busy at this point in my life to dedicate enough time, so the rain-coat is a must. Regardless, I understand the marketing opportunities that this person has brought to your game but you should also understand the implications of having a link to mature content from your game. Which mean anyone with this game in their library has the potential to be linked to the video. Thinking back, a couple months ago, my 5 year old niece had a birthday in Feb, she lives over 3,000 miles away and pressed for time, I had considered purchasing some games for her. This was one of the games she would have received. You, most likely, do not know my sister or what she would do if my niece were to link to that video through my gift but I do. Well, lets just say I wouldn't have to worry about wearing that rain-coat anymore. Besides, I'm not doing this to be a jerk or to give you a hard time, as my time is luxury at the moment, I only point this out to keep the innocence where it belongs, in the kids. You should try the iPad/Android version if you have kids.