Avoid Getting Fooled by Fake Cum!
This article was originally written for Japanese viewers who watch censored adult videos — one of the major characteristics (and obstacles) of Japan’s adult industry.
However, many of the points discussed here also apply to uncensored content from outside Japan, so if you’re curious, we hope you’ll find it informative (and maybe a little eye-opening).
Today, I’m diving into a topic that’s especially relevant for porn fans — particularly those who love swallowing or creampie scenes.
We’re talking about how to tell real cum from fake cum in Japanese adult videos, but the same idea may also apply to those produced outside Japan.
In recent years, with tighter production regulations and the new “AV Law (Adult Video Law),” a lot of fans have started to wonder how much of what they see is actually real.
Maybe you’ve asked yourself:
“Was that real?”
“Wait, was that another fake one?”
In this post, we’ll break down the differences between real and fake semen from several angles — camera work, male actor behavior, and the texture or color of the “juice.”
Adult Videos Are a Fantasy
Let’s start with a fact: all Japanese adult videos are scripted.
Every scene — even the ones that look completely spontaneous — is carefully planned in advance by the producer, director, manager, and actress.
If you ever visit a porn set in Japan, you’ll often find company staff — sometimes even female sales reps — having meetings in the next room.
So yes, that “sudden parking lot assault” or “unexpected insertion during makeup” you see? It’s 100% part of the script — pure fantasy.
During production, actresses and producers always record consent footage for documentation purposes, ensuring that the entire shoot follows the agreed contract.
As veteran director Rusher Miyoshi once said:
“The adult video industry is actually cleaner than regular television.”
The Impact of the New AV Law
In 2022, Japan’s new “Adult Video Performer Protection and Relief Act” (commonly called the New AV Law) came into effect.
Its goal was to safeguard performers’ rights, but ironically, it has made production more difficult for those actually working in the industry.
Under the law, performers can cancel their contracts at any time without penalty.
Filming cannot start until a month after the contract is signed, and the finished work cannot be released until four months after shooting.
This creates long waiting periods with no income, posing real challenges for many actresses and studios.
📌Refer to the “Key Points of Japan’s New AV Law” below.
So, Why So Much Fake Semen Now?
Because the law is strict and anything that might make a performer uncomfortable is immediately banned, many studios have switched to using fake cum to avoid any issues.
Naturally, this frustrates fans who want realism — especially those of us who appreciate “the real thing.”
Why Real Semen Matters
For fans who care, it’s not about shock value — it’s about authenticity.
When you’re constantly questioning whether it’s real, it ruins the immersion and excitement.
Some people claim “all swallowing scenes are fake,” but I can assure you — having been on real AV sets — there are scenes where actresses genuinely swallow real semen.
That’s why it’s worth learning how to tell the difference.
How to Identify Real Semen
1. Texture and Color
- If it’s too smooth, milky white, and uniform, it’s probably fake.
- Real semen is usually uneven, with subtle translucency.
- Fake versions are often made from mixtures like egg whites, yogurt, condensed milk, or even lube.
(Fun fact: the famous “Pepe Lotion” used in Japanese adult scenes and sex trade shops is seaweed-based and completely safe to ingest!)
Comparing it with verified “real cum” videos is the best training for your eye.
Actresses are skilled at making it look and feel like real, smelly cum.
During Ejaculation
Hand Position:
If the actor is gripping just behind the glans and the liquid comes from below the tip rather than the urethra — it’s fake.
They might be squeezing a hidden bag or tube filled with fake cum.
If the mosaic is unusually thick right at that moment, it’s a red flag.
Fake Penis (Dildo Use):
Sometimes, studios use prosthetic penises that look convincing even without mosaics.
Signs: the actor keeps underwear on, the base never shows, or the penis color looks off.
The Art of the Fake Shot:
Male actors, too, seem to have perfected their craft. 😏
Some skillfully fake ejaculation by holding the shaft slightly away from the glans, making it look as if the “load” is actually shooting straight out of the urethra.
When they do this, they’ll often make sure not to reveal whatever they’re holding in their hand — pulling it back like a magician performing a sleight of hand. 🎩✨
📎A still from a video showing a male actor discreetly holding a small container of fake cum right before the “climax.”
Mouth cum shot:
If the camera cuts right before the climax — especially in “swallowing” scenes — it’s almost always fake.
Authentic productions (like Knight Visual) show the entire act with no edits.
💡This kind of trick isn’t limited to Japanese censored videos — you’ll occasionally see it in Western productions as well, so it’s worth keeping an eye out.
Creampie Scenes:
When a scene cuts right before ejaculation, a syringe is often used to inject fake semen afterward.
Even when a condom is clearly visible, you’ll see white fluid “leaking” — that’s the giveaway.
I’ve actually seen staff members on set mixing up fake semen and loading it into a syringe for use during filming.
When it comes to internal ejaculation (“creampie”) scenes, though, it’s understandable — any accident could put a huge burden on the actress, so this kind of precaution makes sense.
👀This practice isn’t limited to Japanese productions. You’ll sometimes see the same technique used in Western adult videos as well.
Beware of the Prosthetic Penis (Dildo)
There’s also a tricky pitfall even when following the earlier checks — the prosthetic penis. As mentioned briefly before, some productions use highly realistic dildos that can eject fake cum from the tip. Even without mosaics, they can look convincingly real, and because the liquid comes out from the tip, it’s difficult to tell it’s fake just by looking through the mosaic.
Check 1: Color Consistency
Pay attention to the color of the penis during oral sex versus ejaculation. Fake cum often looks slightly yellowish or off-color. (Of course, some productions may have adjusted for this, so it’s not foolproof.)
Check 2: Is the Base Visible?
Watch whether the base of the penis is shown. Often, during ejaculation, a cut happens, and the base is never visible — a potential sign of a fake penis.
Check 3: Wearing Underwear?
If the actor keeps underwear on while only the penis is exposed, it’s suspicious. An unnatural bulge at the base usually indicates a prosthetic.
Sometimes, even in creampie scenes, the actor might pull out and reinsert to make it look like real cum — a trick to mimic authenticity.
Check 4: Constant Hardness
Unlike professional performers, some amatuer male actors start off less than fully erect. If someone is rock-hard from the start with no variation, that can be a red flag.
Real Creampie Indicator
If the man openly masturbates and then ejaculates directly onto or into the actress before she uses that sperm for masturbation (“semen masturbation” scenes), it’s almost certainly real.
Studios like Hon-Naka and Moodyz have historically shown these shots clearly.
By Studio
Studios that have always prioritized using real cum rarely use fake semen. Interestingly, these studios often release fewer “swallowing” titles nowadays, or sometimes none at all.
Here are some studios you can generally trust for authenticity.
Check out those studios below.
By Director
Directors well-known for swallowing scenes are unlikely to use fake cum. However, since the introduction of Japan’s new AV Law, some productions may occasionally use it in parts of a scene — though you can usually tell when that happens.
By Packaging
Some titles explicitly state “Real Semen” on the package. In such cases, you can be confident it’s genuine — although, amusingly, the quantity might sometimes be underwhelming. 😅
Uncensored or Unregulated Works
For uncensored or unregulated titles — often from overseas — you can be fairly certain that the sperm is real. With a little observation, it’s usually clear that no prosthetic penis is being used.
Additionally, actresses performing creampie scenes in overseas videos are highly likely to be receiving real ejaculation, even if the content is censored.
Can Cum Cause an Upset Stomach?
This story comes from Mai Miura, an actress who has since retired, and her experience filming a swallowing scene.
Back in the day, many actresses would share updates on Twitter during shoots:
“Today’s filming — I’m nervous!”
“Just finished the first scene, taking a break! That felt good!”
Mai Miura herself posted updates the day before filming a swallowing scene for a production studio, RASH.
On the day of the shoot, she tweeted in real time:
“About to do a swallowing scene now!”
“Finished the first scene… swallowed X loads!”
Even the author was quite excited following these updates.
After the shoot, a while later, she tweeted:
“OPP hit me” (OPP = upset stomach 💦)
For Mai, it was her first time filming a swallowing scene, and although she had heard that it could upset her stomach, it finally happened — confirming the rumors were true!
Actresses who have prior experience, or who have received advice from others, often discreetly induce vomiting off-camera during swallowing shoots. True professionals — and we owe them gratitude.
As a result, information about cum sometimes upsetting the stomach has circulated among actresses, which is one reason some prefer to avoid using real jizz.
Studios Known for Using Real Cum
Note: Some sample videos linked in this article may not be accessible outside Japan. If you’re located overseas, using a VPN set to Japan should allow you to view them. We personally recommend Proton VPN — it’s reliable and helps you access geo-restricted content safely.
NamaNama (RawRaw)
This is a relatively new studio that started in 2023. They cast a wide range of actresses, both well-known and lesser-known, and focus on continuous creampie-themed productions.
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