I am one of the lucky ones. Even if an objectively attractive woman--one with supple, pouting breasts and firm thighs, for example--walks up to me and starts to flirt, it provokes virtually no sexual arousal in me at all.
Others are not so blessed. There is a good movie I recommend about teen-boy masturbation called "Cyber Seduction." It is about how a high school-aged swim team member becomes trapped in the clutches of internet porn. Just looking at women with large breasts ruins this poor man's life.
It is a good movie for the following reasons:
1. The movie does not depict him masturbating, mercifully leaving this aspect of the production to the viewer's imagination rather than to lurid, explicit imagery.
2. The boy is not a gaysexual, as he and his swim team buddies walk around without their shirts on a lot and this does not provoke arousal.
3. It has a good role model in his pimple-free, long-haired girlfriend, who is saving herself for marriage.
I have seen the film again and again and have shown it to young males to whom I minister one-on-one in my Christian apartment. I highly recommend it, and have submitted an excerpt below. At around 3:50, the teen turns to the internet starts to look at the forbidden. By 4 minutes in, you know that his genitals are probably really hard, pressing against his Hanes, possibly leaking just a little bit, and I always suggest to my ministerees that we pray at this point.
The movie does not show it, but I always assume that this young man dies and goes to Hell, where he is sodomized by demons and otherwise abused, and learns the pain and humiliation that are the true result of sexual arousal.