Oh shit! I didn’t want this to be lost at the bottom of a discussion, because I think it’s important, but….
It’s a kind of semiotic problem. Movies can’t tell us what people are feeling, like descriptive words can. So, given that most male orgasms during conventional sex happen inside a woman’s body, and while you can use convorted facial expressions to try to illustrate that an orgasm is being had, the convention of having the guy pull out, and spew “spooge” all over the woman is a visual way of expressing the orgasm. So pulling out was the solution to a problem that visual media have—the difficulty of depicting internal feelings.
Now, you could depict this ejaculation over any part of the woman’s body. However, you also have the problem of showing how the woman is reacting to the male orgasm. Remember, most porn is aimed at males, and is designed to help them masturbate. So, by showing a guy ejaculate over a woman’s face, you can also show her look of pleasure or satisfaction that she has done her job well. In the male fantasy, as I’m sure you know, it’s all about his orgasm, and the female orgasm is secondary—perhaps not even necessary. Of course, there are men for whom this is not true, but a lot of me, maybe almost all, like the idea of a “free” orgasm, where they don’t have to do any work and the woman gets pleasure out of it, too.
That’s why the idea of Deep Throat was so popular. It absolved men of having to do anything at all, while getting what, for some, is the best orgasm of all, a blow job. The woman has an orgasm stemming, somehow, from her throat.
From the time porn started becoming much more wide spread and acceptable—say in the 70s, this solution to the problem of depicting orgasm has been seen by more and more people, and, in particular, impressionable teenage boys. Boys, not having experience with sex, essentially learn from porn, and they believe that porn is real, and show sex as it actually is and as it should be.
So, that’s what they do. Now, I think that men can be educated to understand that their partner’s orgasm does matter, and they can do things for women, just as women do things for them, and that women really don’t like having cum spilled all over their faces.
In a similar vein, women can also communicate the things they like to do for men. For example, I always thought that women didn’t like to taste or swallow cum. These same porn movies often show women reacting with pain and disgust when they get cum all over their faces or in their mouths. So it was a surprise and a delight to discover, a couple of years ago, thanks to discussions with women on sites like this, that some women enjoy giving blow jobs and also like the taste.
I don’t think you are off on the domination theme. But I think this came later, after the porn problem was solved, and porn had to look for more and more extreme things to excite their audiences. Again, to cum on a woman’s face, and to have her like it or hate it, means you are getting a strong reaction, favorable or not. In either case, you are giving a woman a strong experience. If you like women, you want your partner to be happy. If you are pissed at women, and feel inferior for whatever reason, then if she’s upset by this, it shows you have the power to do it, and she has to take it.
Here, of course, one could get into very complex discussions about a variety of issues. What dominance/submission about? What, in people’s upbringing, might lead to feelings about self, and are these feelings related to what they get off on? What do men and women secretly feel/fear about each other? Etc. Etc.
As boys these days grow older, they take this understanding of what pleases women with them, and so the practice becomes more and more widespread, just as practices of shaving the pubes are becoming more and more widespread. Again, this practice probably has something to do with semiotic problems that movie-makers have. Perhaps the problem of showing, ever more explicitly, the cock going in and out of the cunt. I don’t know. I’m sure other people have other explanations.
I think that all the emotional explanations play a part in explaining this behavior, but I think the thing that a lot of people are not aware of is the problems that porn has in expressing feelings. The solution they came up with, and the impact that solution has on passing on information about what sex is about helps us understand the spread of this behavior.