I saw somewhere a video a video of a guy who asked a woman to hold her hands about 9 inches above a table for a magic trick and she held it like 12 inches above. if anyone knows what video im talking about linking it would be awesome since i can't find it

Also, i've noticed during either FWB or LTR, females say he has a big one, fucks good etc. Then when it ends, they turn it around saying he has a small dick can't fuck for shit. I know it is to kill their confidence or something, but is there logic reasons for woman not to be able to estimate penis size? For example my dick is 6.5 inches, and women believe it's 8-9inches...

Also if it's a 5 inch dick they'll think it's a 4 inches.

There must be an explanation for this?