What's the relationship between the kissing scene taken by the stars and the sex scene? Did you take protective measures?

Kissing can be filmed directly, which is true, because we can all see that some actors even pretend to do it. Sex scenes are generally borrowed, that is, from our point of view, two people are together, but in fact they have no physical contact or intimate contact, which can't be true, but it doesn't rule out that some movies are true, and Lust, Caution should be true.