I’m looking for an action B-movie, VHS… I remember that at the beginning, the protagonist wakes up from some kind of medical procedure (?) and the nurse wants to check his reflexes or something. She undresses and they have sex.
It isn’t Deathline (1997).
UPDATE:
I thought that I saw something similar in an Olivier Grunner shit movie, but I have just skimmed through “Nemezis” and I did not find a scene like that, so probably this is not the right movie. I probably misremembered, it seems that it was not an Olivier Grunner movie.
Maybe?
I knew that it was one of those B-movie stars, but it was Jeff Wincott and Michael Ironside, not Olivier Grunner. That female nurse is stunning, she has some serious bumpers. 
”The Killing Machine” (1994), also known as “The Killing Man”
IMDb:
https://www.imdb.com/title/tt0110263/
Man is in hospital bed after a face transplant procedure:
Female nurse undresses at his bed:
Nurse has sex with the man in bed:
You can watch the trailer on YouTube here, at 0:19 the man is in the hospital bed after the procedure, at 0:32 female nurse undresses:
SAME DAY UPDATE:
I managed to find the full movie on the internet (you have to disable VPN to watch it), the female nurse scene with the undressing and sex starts at the 0:11:50 mark:
