This show is AMAZING! I watch it regularly with my dad, and their witty dry humor makes my day. It's not for everyone, but definitely try it out!
Although this show has a relatively PG overall feel, there is definitely a more intense undertone that comes out every once in a while, causing the show to go off color for a short period. They quickly rebound however and don't dwell on being lude, but not before you get the chills when your parents are around. Let me explain:
Sex: This show is overall not a crass or lude show. However, because it is a comedic show where they comment throughout the movie, the content they draw from the film can become crass and lude, even if for just a second. So, expect about on average 2-3 fast flying innuendos for each episode. Its a know your kid moment. I recommend previewing for anyone under the age of 12.
Violence: almost a non issue. Their banter could make Alien as tame as Veggie Tales. Any violence whatsoever is proceeded by a funny line, cutting whatever gravitas the moment had off.