The original Treading Ground comics were created between 2003 and 2011. As such, you'll find some unfortunate hallmarks of raunchy comedies of the time. These include casual misogyny, dubious sexual situations, insensitive edgelord humor and a character using the r-slur.
While these are not typically portrayed as positive, it's definitely not how I would write the comic today, and you should know that going in. That said, there's still a lot of good stuff here.
There's also some nudity. Consider the whole comic NSFW!