This thread proves:
1 - Belly bumps are real. Those wannabe anatomy experts who call it impossible are wrong. Not only can a penis make a girl's tummy bulge from the inside, you can see good definition if the angle is right.
2 - Can't actually reach a girl's belly button from the inside, vaginally. Despite many descriptions on this thread and contrary to some actor dialog in the scenes, no confirmed penis imprint (or toy imprint) has ever been spotted as deep as her belly button. Not even with Samantha Luvcox, Amazing Ty, or LaylaExtreme. If those women can't do it then it can't be done.
3 - A full penis "outline" is rare but not impossible. We have examples of scenes clearly showing the full outline of a guy's penis in a girl's belly, but normally the best you see is the head poking upward.
4 - It does not appear painful. In most scenes the girl is more into the bulging than the guy. If there is any discomfort at all, pleasure and curiosity seem to overrule. Many girls actually like feeling a man inside them that deep. Even porn girls point to it when it happens and almost always place their hands directly over the bulge and press to feel the penis moving inside them.
5 - You can massage a penis through her stomach. Not many scenes showing this but a few. Usually the guy doesn't want to hurt her by pressing down, but girls will press really hard on their own belly just to feel the head inside.
6 - Your dick is in her belly/tummy, not her stomach. Duh.
7 - Works on chubby girls too. Sometimes surprising but it does.
8 - Works best on skinny girls in piledriver position. In piledriver gravity moves her other insides out of the way and you can see crisp perfectly formed belly bulges with every thrust.
9 - The guy doesn't need to be packing. Average size will still put a bump in her tum in the right position. The monsters do a much better job.
10 - Some girls don't bulge no matter what. Ultra skinny petite little hot porn girls and gigantic porn sausages rammed together without so much as a wiggle in her belly. Even piledriver doesn't help. Mystery of the universe.
11 - Toys and other objects work really good. We've seen girls put an entire American football in their vagina or stuff inflatable soccer balls up there. In those cases we see their belly distend perfectly in the shape of the toy. Creepy but also erotic.
12 - Girls like it. The girls seem way more into a penis imprint in their stomach than the boys causing the imprint. Most male porn actors could care less but the girls get very excited.
13 - Cameramen suck. We have proven something we already know, porn camera operators are retarded. Scene with perfect petite girl and massive cock, the camera operator will always give you a gyno-exam pov during reverse cowgirl just to make sure you can't appreciate anything that just happened. When her pussy finally swallows him balls deep, they cut to a shot of the guy's bung hole. Gross! When the belly bulge happens and she points right at it, the camera guy goes to her ugly face or the furniture. The reason spotting the belly bulge is like finding evidence of Big Foot is bad camera work.
14 - No full scenes dedicated to this topic. Nobody has ever shot a full scene dedicated to the penis imprint. It would be cool to see a monster guy and petite girl working together to get the best bulges in multiple positions. Something that will never happen in the history of porn. Jack Napier has been really good about this in several of his his recent scenes. Shane Diesel will often show his junk on top of her belly. Danny will occasionally come close if he has a petite girl. Mandingo has some of the best close calls but his camera guys always find something better to focus on at the critical moments. Lex never seems to notice. Dani Jensen gets a belly bulge whenever she has sex, so does Alexia Skye. Amai Liu is aware of the bulge and goes out of her way to point it out but the camera guys go out of their way to screw it up. FTV has not figured out how to show bulging yet, but they do show against the bellies how deep each toy goes.