Why don't actors have physiological reactions when shooting passionate scenes?

1, in order to put an end to this kind of thing, sometimes the director will arrange for actors who make passionate scenes to eat spicy food, such as garlic, leeks, stinky tofu and so on.

2, when filming, the two actors are not one-on-one. For the shooting effect from all angles, there will be dozens of people around the actors, probably not in the mood.

There is also the problem of angle. In the way of visual dislocation, you think that boys and girls are in physical contact, but in fact they are in physical contact with the photographer, while girls are in a misplaced perspective next to the photographer.

3, some very violent scenes will require actors to tie their lower bodies with tape.

Generally speaking, it is difficult to happen.