What's new- Fucking machines and the Coolege effect

A few years ago I was surfing the web for porn as I often do when I came across a post about fucking machines. At the time I had never seen such a thing and I was instantly aroused and fascinated. I started looking for more, but unfortunately the only thing I could find was that single short lo-resolution clip. Still I was completely taken by the thought of a beautiful woman having sex with a machine explicitly designed for that purpose, so I blew my load over it.

Later I would run across more fucking-machine porn. At first I'd get excited and beat-off over it, but as time went on I became less excited by it. Now I still appreciate quality fucking-machine porn, especially when the babe being done is really hot. But I've become much more discriminating over this particular porn genera.

This is by no means an isolated incident. I'm usually turned-on by some new perversion when I first encounter it. I'll masturbate repeatedly over it, and then that compulsion slowly dies down. The same is true with sexy babes. I'll come across some new gal and for some reason I might be smitten by her. I'll jerk-off over her and collect more of her porn, but soon I'll go on to someone else. Of course it's always nice to revisit some of these old flames, but often it's not as intense as that first time.

This brings us to the Coolidge effect. Wikipedia describes this as “a phenomenon—seen in nearly every mammalian species in which it has been tested—whereby both males and females exhibit continuous high sexual performance given the introduction of new receptive partners.” Said differently, new pussy is usually more erotic.

Behaviorists would tell us that we should tend to repeat whatever is associated with reinforcement. And what is more reinforcing that an orgasm? So based on this principal wouldn't you expect that we would end up masturbating over the same porn image all of the time? But when it comes to sex (as well as many other things) there would seem to be a certain tension between repetition and novelty. I masturbate all the time because it feels so good, but why was I excite the first time I saw machine fucking?