mine is in my signature. Its not real money making but google likes it, and so its a small source of traffic for nefarious purposes.
plus it has a mild reader base i hear from sometimes :p
one of the best examples of a high traffic adult blog is
http://johndx.blogs.com/
guy doesnt make a lot of money but he does have a ton of traffic he can use for other nefarious purposes.
Alex's Naughty Wife,
http://www.naughty-alex.com/index.htm
is one of the more successful ones that i'm aware of out there.