I also use sigils! As Milo Duquette said, "Magick is all in your head, you just have no idea how big your head is!" :) When I do workings, I will sometimes put sigils on my "weapons", clothing, body, etc. It helps me sharpen my mind for the task at hand. This is more of a side course than entree use, but when it comes to sex magick, I'm all about visualizing those sigils!
Two other methods that I use are the "Rosy Cross"
and the "magick squares"
I use the magick squares if i want to get uber specific and use a planetary energy.
But when shit hits the fan... I need to get something done on the fly... i use the method you put in this post! Great post! Following!