Anal
What I like to use for anal stimulation is to find a frozen hotdog and microwave it for only thirty seconds. This way it feels still cold and stiff, but a little mushy on the ends and outside like a real penis. Then I lube up my ass and stick it in. After a little bit, the cold hotdog really relaxes my asshole and it slides in and out with ease. I usually do this with my legs up over my head so when I finally cum it lands on my face or in my mouth. Also, if I video tape myself I find it a huge turn on to watch myself do all those nasty things later on. Just emagine jerking off to yourself!