Well, also, wouldn’t they use a condom in actual penetration, as to avoid pregnancy and/or STDs?
If I recall correctly, Asia Carreira discusses this on her website*. I believe that it’s a requirement in the industry, although I don’t remember the exact details as to why. Perhaps someone who’s not at work can go check it out.
*No link, cause I don’t want to get banned.
So, you noticed a trend, eh? 
Seriously, this is the “moment of truth” for male porn stars. Women can thrash around and moan as much as they like (c.f. Teri Weigel), but a man can’t “fake it.”
Discounting fetish series where the objective is to do such things (bukkake, oral/blow job films, etc.), it has become, like AskNott says, part of the more raunchy convention of today’s X-rated films. The viewers want to see the girl, they want to see her get treated like a slut, and they want to imagine releasing their orgasm on her in a rather demeaning way - pretty simple.
Tangentially, I also recall hearing from the woman’s point of view that if the camera is busy watching the cum shot, it’s good for your star power for your face to be on the receiving end, simply because that’s where the camera is pointing. I don’t know that she was in the majority on this one, though.
In most cases, it is most definitely the real thing, however much that may gross some people out.
However, I have seen at least one film in which the ending was edited together with a shot of a fake penis spewing fake stuff onto the girl in such a way that we were supposed to believe it was real. This girl didn’t (and still doesn’t) like the real thing, but I don’t know how much of a factor her desires could be.
Yes and no. It depends on who all is involved.
Some production companies, like Vivid, are “taking a responsible stance” by having their actors wear condoms. It’s partly functional, but really more lip service (no pun intended) than anything else. Most of the time you’ll see the actor take off the condom for the “money shot” at the end of the act anyway.
Most producers, however, eschew such protective methods in favour of giving the fans what they want; this is, after all, supposed to be a fantasy, right? There are no such nasty bugaboos as STD’s in a fantasy world, and hence no need for condoms.
In fact, some producers go to the opposite extreme and engage in some activities (chiefly unprotected anal sex combined with oral or vaginal engagement) that would otherwise be considered terribly unsanitary, simply because they know it enchances the whole “treat her like a slut” fantasy.
Some performers - primarily those who can expect to bring in a lot of business - actually have a substantial say in what, who, and how things are done to/for/with them. In some cases, this may even work its way into a film contract, allowing a Devon or a Jenna Jameson to demand that male co-star wear a condom or not do certain things with her.
Can I bother either handy or UR for a cite dealing with the ‘porn semen is fake’ comment.
I think this is called the “money shot” because the women who take it on the face/in the mouth get paid 4 or 5 times more than the man doing the shooting.
I am shocked…yes SHOCKED at the lack of women coming forth to express a love for receiving facials! Particularly since I know so many subs on this board.
What a great act of submission it is to be covered in your lover’s semen. God I LOVE IT.
really.
J
My last girlfriend enjoyed it quite a bit. She almost always wanted me to ejaculate on her. I didn’t care one way or the other, really.
I don’t mind seeing it in pornos, but I don’t like the cum-drool, mush-it-in-your-mouth shots. Those are kind of gross.
This isn’t just a porno phenomenon. Movies of all stripes are visual experiences. In other words, if you don’t see something happen, it might as well not have happened.
Think about other types of movies. In an action movie, would you be satisfied if you were merely told the bad guy had been killed, and you didn’t see him fall off the roller coaster and get impaled on the unicorn on the carousel? No, and in fact, you’d wonder if he didn’t actually die after all. Or in a romance, would you be satisfied if somebody reported secondhand that the two leads had kissed and made up and gotten married? Nope.
Same goes in porno. If all you see is the guy grunting and twitching, how do you know anything happened? At a very basic level of visual-information processing, it’s more psychologically complete somehow to actually see the undeniable evidence of climax, even though if, in reality, it’s a practice that a minority of people enjoy and practice.
Why do you think female “squirters” are in such high demand?
Uh, jarbabyj, want my number?
I’ll even wear my “welder” outfit for you!
“I’ll even wear my “welder” outfit for you!”
Doesn’t that cover the face?..
I once saw a Porno Blooper film & they used all this fake cum, in other words, they showed them actually using it. OF course, this is a long time ago, before women properly trained me not to watch such oppressive media.
The wetter and stickier the more my SO and I like it. This is sex, folks - it is supposed to be sensual (lots of sights, sounds, smells, tastes, textures).
Jarbabyj, I admire your honesty as so many folks think it’s something only those nasty porno actors do. It’s an act of extreme intimacy and for some one of submission. Fortunately some of us know submission does not mean inferiority or degradation, far from it. Submission takes strength.
FTR real men do kiss a woman after coming on/in her and if he doesn’t get his face covered in her fluids when going down he isn’t doing it right.
On the topic of fake spooge I know someone who specializes in “messy” photos of various kinds. Nothing gross like scat or hurl<shudder>, but things like paint, whipped cream and chocolate syrup. Her favorite substance is methylcellulose “slime.” It’s an additive used in things like shampoos as a thickening agent. You can get it as a powder from chemical supply stores and I think there is even a food grade version. She loves it because she says it has an incredibly silky, slippery feel on her skin. I have never seen any substance that looks more like semen. She drenches herself in gallons of the stuff. Picture “after her date with Godzilla.”
Jar, I may have to wear my auto dark hood and deerskin TIG gloves to bed one of these days, lol. Don’t know if my honey will like it or just think I’ve totally geeked out.
So are we asked and answered on this?
Except for the “fake cum-shot” thing, which has been alleged and alleged in this forum, always without a citation.
I have no idea whether its real or not.
But imagine the fun that could be had with a squirt-gun filled with a substitute in a dark old fashioned porno theater.
I would like to be able to site the fake cum theory, but whenever I search for the fake cum web sites, there are like 34,767 porno web sites to wade through, ugh & Then clicking on one opens 25 more windows.
Some things I learned a long time ago from people who know people in the business & there is no way to verify that for ppl here.
But then, in fairness, I don’t see anyone posting sites that say it’s real either… 
Well cripes, it can’t ALL be fake, I’ve SEEN IT COMING OUT OF THE DICK…unless they go to all the trouble to implant it into penis of the star, there’s definitely some true and honest semen flyin’ around.
Wading in (with my boots on, it sure is thick in here)…
There is such a thing as fake cum but I don’t think it is associated with fake male orgasms (this I have never hear of). I saw a special on a French porno actress (Rebecca something) who doesn’t do facials. They used fake cum for the money shot during her photo shoots for web sites, adult magazine, etc. They just spoon it out all over her while some guy pretends to be getting off, and then they snap a bunch of pictures. Easy enough to do in still life, a bit more difficult in film/video. The funny part was that apparently it tasted terrible as she spewed it out as soon as the photo shoot was over.
(My apologies for no citation. I think we may have seen it on a Playboy special about adult movie actresses but I’m not sure.)