I have a question regarding the second season.

I am thinking about buying the second season on DVD, but the only problem is that it is rated MA. I am not a big fan of MA rating type shows, but if it's something mild and less disturbing, I can watch them. The only thing I need help on is what content does the second season have? Is there any hard core violence? Sexual content? Etc? What stuff is in this season to make it an MA rating? I am just looking for answers and opinions because I might consider to buy this DVD set once when I go after birthday shopping (my birthday is next Saturday).