How to tell if people in a video are really doing something and not just acting

[dihuang]

I don’t refuse to perform, but I want to know what is real and what is fake, and I don’t want to be deceived by a set of pictures.
1.Many of the side angles are hitting the buttocks only
2.You can't do it without lubrication or the act of penetration
3.It is very likely that the soft one will not be able to enter.