Excellent suggestions. An enema kit that you get form a sex shop can make it a very clean experience. You can get small finger sized butt plugs that you can wear before you get to actually doing it.
As for alcohol, yes I am much more into anal after a few drinks.
I find the best position...
I myself have rape fantasies all the time. I worked in the sex industry for years, predominantly in a dominant role. I know exactly what a lot of people jerk off thinking about.
Of course there is people that might get off thinking about the scenario you are discussing, then again, there is...