I've responded to other similar threads on this. I am a very oral person so licking, sucking, kissing and many other activities related to that get me very horny. I do like sucking myself and cumming in my own mouth but don't do it that often. It's not hard for me to do. When I'm having sex or jerking off, I can just bend over and lick and suck the head of my dick. The feeling is quite intense and exciting to me .I also enjoy throwing my legs up over my head and shooting off into my mouth. I like the taste of my own precum and cum so that helps. A lot of guys are grossed out by the idea of drinking their own loads but I feel just the opposite. If you're really interested in self-sucking, there are several websites devoted to it with vids and photos.