As a reviewer for two sites that list adult blogs, I think that most bloggers are missing an opportunity to make your voice heard and maybe educate your visitors a little. Don't you get tired of just writing advertising copy? Adding political commentary would also have perks related to the search engines - new keyword phrases to be found with. An example of an adult blog where the bulk of the writing is about 1st Amendment issues and the religious right is:
http://www.sexxxxpics.com/blog
Some sort of variation of that format might work well on other adult blogs, and it would be nice to see more adult bloggers writing about issues. It would certainly make the reviewing a lot more interesting.