You may think i'm going to be against you for the crap you usually dish to myself, but i'm not. It's straight forward, Emailing is spam, its crap & it's not effective. I, as most people, delete any email that looks like spam or mentions porn & adult.
In your face letter dropping, it can work, I keep the occasional takeaway leaflet, but nothing like a search engine, the phone book or yell.com.
Most people that are looking for porn, don't want to turn their pc on, check their email & find a load of porn emails on it.
If the email is designed for the webmaster, then they just want to see the updates & galleries available, as most of the programs do already.