If your friends are claiming this as fact, I'd have to say they haven't ever been with a real women. Never mind that they haven't experienced a woman of any different race or ethnicities.
How old are you and your friends cjc?
This is just more of the usual nasty racial stereotyping by very ignorant and uneducated people imo.
Never believe any type of nonsense like this! "Asian women have tight cunts"
"Women who've had babies have loose cunts"
"Pussies all taste like milk duds/apples/oranges/fish sticks".
Black/white/Red women have tight/large/loose small/big/floppy lips/cunts/tits.
cjc it is just trash talk by the uninformed and inexperienced.
Don't believe a word of it.