I don't wanna sound polemic but I would have named this thread "It's 2017 and some people still expect creampies in JAV to be real"... 99,999% of creampies in JAV are patently fake
LOL but you ARE being polemic. But that's ok. I guess I too like to sound polemic from time to time.
I found myself waffling from day to day, changing my leaning when I read from different sources. Partly because, as I made clear many times, I don't feel passionate about the issue of "real". I only care about "realistic", or maybe not even realistic, as I mentioned elsewhere, one of the themes I enjoy in JAV is "fake", like fake futa, fake huge dicks (over 30 cm), fake massive ejaculation (over 100 ml).
Anyway... on one hand, I agree it's perfectly sensible most sex scenes were shot with condom on. At least the SOP is perform the pussy (sometimes anal) fucking with condom and finish with a condom-off jerk-off on the idol's face or body. I think I do believe most of the external ejaculation is real sperm. If the director+actor+editor+censor is half-good, they can shot/edit/mosaic the scene to pretend the fucking was raw (condom-off) too.
Now the reason to believe most sex scenes are condom-on is safety and hygiene. But real sperm is spilled on the idol's face regularly, so we know safety is not at all ironclad. More than one type STD can transmit by sperm-to-skin or sperm-to-mouth/nose/eyes.
I think the safety margin is high, if the studs are checked regularly, and the industry is not so free-for-all, then it's somewhat manageable to ask everyone to act responsibly. Of course it's not absolute, but Japan is a society with a strong tradition of trust and responsibility.
OTOH, Japanese tradition also accept some level of risk in both professional and personal life. Making sacrifice or taking risk on the job is within expectation, this is much more so than in Western world, esp. America. The mind set in America is the employer can fire the worker tomorrow if
maximizes shareholder value. So the worker would be stupid to take any risk for the company. So one piece of evidence is that you read or hear (I haven't tried it myself) you can find soapland etc, that after you establish trust and for the right price, you can enjoy raw service.
So it's not impossible to believe that at least some AV idols, given some established trust etc, would agree to perform raw sex (condom-off fucking but external ejaculation) or even real creampie (internal ejaculation).
Part of the reason to believe at least some real sperm (on face) and some real creampie (in pussy) are possible is that quite frequently you see the fake ones. Huh? Maybe that sounds contradictory to you? Well my logic is that when you see fake ones, most of them look rather clumsy and un-professional. That means the industry standard isn't very high. It's not really worth the while, not worth the studio resource/investment to make the fake ones
very realistic. Basically you see 4 different kinds, (1) the old SOP, they actually let you see the stud pulling off the condom, they are not pretending anything, (2) fake and clumsy about it, they don't want to acknowledge the fake, but also lacks the determination/resource to do a good job of faking it, expecting the fans to care just as little (many fans including myself might finish masturbation before the finale of the scene) , (3) looks very good but still doesn't hide the fact that it's a special effects (SFX), most especially those rare, very well-produced SFX AV: fake futa, tentacle porn etc, and (4) those that look so realistic, it's debatable if they were real or SFX.
If you think thru how types (1), (2), (3) look on screen and sees a type (4), well I tend to think it's easier/cheaper to convince a stud/idol to do it for real, rather than invest the money/talent/time to make a fake one look very realistic.