Where do masturbation fantasies cum from

I have a number of masturbation fantasies. I even have a masturbation fantasies blog. One of my masturbation fantasies is about being a cuckold. I can't say that I would actually like to be cuckolded, but it's a masturbation fantasy that's made me cum many times. Things weren't always that way though. I can remember the time when I got my first hard-core mag. I was nervous when I went into the news store. I went into the back and looked at the porn mags with the other perverts. One of them had a cute brunette babe who turned me on so I took this one up to the clerk in the front of the store. I recall some lady in front of me in line who looked at me like I was a pervert. Then I bought the mag, got it bagged, and got out of there. Back then I was a college student with very little money and for me this was a big expense. But I got my moneys worth. I took my time going through that mag and I only looked at a few pages at a time, blowing my load without looking at too many of the pics at a time. She was in a red bikini by a pool. At first she was just stripping down, revealing her lovely titts. But later she was masturbating. This was a real thrill, the kind that made me shoot cum so hard that it landed in my face. Next a couple of guys showed up. This was a bit of a disappointment, as I wanted her all to myself. I masturbated to the pics of her sucking cock and getting laid without paying attention to the studs. I remember wishing that the whole mag was only of that babe. I believe it all started when I was hanging around with the woman who took my virginity. I knew she wanted to screw, and so did I, but I just couldn't bring myself to make the right kinds of moves. She must have been really frustrated. One night she was dropping me off at my place and we kissed passionately. She put her tongue in my mouth and it really turned me on. I went inside and masturbated to the memory of our kiss. The next time I saw her she related to me that when she got back to her apartment she stopped by two male neighbors and had sex with both of them. She explained that she had been aroused by our making out and needed to have sex. Well my reaction to this was mixed. On the one hand, I was embarrassed since I was obviously not up to the task of satisfying my girlfriend. On the other hand I was strangely turned on my the thought of her having sex with two guys. Unfortunately things didn't work out for us but I soon was hanging around with a new girl (who later became my ex-wife). I started hanging out with her quite a bit and really developed a crush on her. Then someone told me that she was living with some other guy. I was devastated! That night I couldn't sleep. I was really upset and all I could think about was how she was living with this other guy. I decided that I wouldn't hang out with her anymore. At some point I decided to masturbate. As I stroked my dick the thought of her being with this other guy kept coming into my head. I tried to keep it out but eventually I thought of the two of them screwing and I blew my load. The next morning I intentionally masturbated to the thought of them having sex. I decided to keep hanging out with her and eventually she broke up with that other guy. We ended up living together, having sex, getting married and later divorced, and all because I masturbated while fantasizing about her screwing with this guy. When my ex and I were living together before we were married she once told me that she was going to have a male friend visit and she wanted me to be out of our apartment for the weekend. This upset me very much and we had several arguments over this. She said they just had a platonic relationship, and besides, the guy she was living with before me had done the same to her. She said he was going to sleep on the couch, not in her bed. In the end I left for the weekend. I considered breaking up with her but she came and got me early, saying that she had a change of heart. Sometime after that we broke up, got back together and married, and then divorced. When we divorced I took a collection of pics of hers with me. I masturbated to a lot of porn, but I also masturbated to my ex's pics. One of them was of her taken by that guy who had visited her. She looked very nice in it. I would masturbate and think of her as being his girlfriend when that pic was taken. I named that pic “Wayne's girl”. I also had a pic of them standing together. I would also imagine what they might have done on that visit. I would also imagine that she was having sex with other men now that we were divorced. Of course, there was nothing I could do about this now, nothing but masturbate. As time went on my fantasies became more elaborate. At first Wayne would get up from the couch and slip into bed with her. Maybe she would protest a bit but then he would fuck her. Maybe that's why she called his visit short. In later fantasies she was the one who seduced him. Then I was involved. I would go to the bar down the street and get a bunch of guys to come back to our place and fuck her. Not only was I having these fantasies, but I was starting to enjoy masturbating over pics of pretty girls being screwed by guys. I'd run across some sexy babe and masturbate over her beautiful body. Maybe some nice looking girl, like Lucy Lee, who in my naive days I wouldn't have dreamed that she'd even take her clothes off for the camera. Of course I'd like her all for myself, but I can't have her. So it's a real treat to run across some pics of her getting fucked by a huge cock, or better yet, 12 of them.