None, really... at least, not in the stories I draw. There have been times when a collaborator would start to second guess things worried if people would be offended or get the wrong idea, but that's the time to push harder rater than fall back. So far this philosophy has worked out pretty well.

There are some things I would like to do but I lack the experience or skill to do the subject justice, so I don't go there yet. I'm way too much of a fence-sitter to take sides in politics or religion and I haven't the experience to do any kind of proper slice-of-life kind of story. And I'm really BAD at adult content.