That will definitely make the scene easier to do but it will be annoying because he will have to do the same thing over for different angles and close ups...I recently did a sex scene for a short and it was kind of annoying because you couldn't progress like if you were doing it for real...and had to do the exact same motion...im like in my head just say cut already and I swear the director said one more time like 20 times...I think he was getting off on it