How are the sex scenes made in Korean movies?

Female perspective (that is, the kind where only men are moving on the screen) has no actresses. . . There is only one person lying on the ground. . . As for the men and women who appear on the screen, they are basically naked, but things like band-AIDS will be stuck on the lower body. . . It's hard for an actor. . . Some are borrowed, and the eyes can be deceived. . . In most meat scenes in Korean movies, there will be something blocking the lower body, such as the actress's skirt and underwear underneath. . . If it is not porn, it is impossible to fake it. . . If it is really filmed, it will be banned. . .