Those were (and are) the craziest mainstream films. All that must be in the movie is there : violence, gunplay, swordplay, severed limbs, sleazy sex, naked girls, no PC AT ALL.
Just watch some of Fukasaku fims or anything with Meiko Kaji to see my point. Frankly, if any pornstar would go for Kaji or Junko Fuji image (with gaping anal twist, of course), that would be my heroine. And if any adult filmmaker would try to make porn version of "Yakuza papers" or "lady snowblood" this guy can count on me to be te first to buy it.