2. A woman and a guy are in a room...kissing and ready for... Cheers Lookingup...and then the woman kill him.. with a drill inside her stomach.In that scene i think that first they only showed the guy face in pain with the drilling sound.then they showed the thing coming out of her.Maybe she was a cyborg or something.
#2 is almost certainly "Steel and Lace" (1991). She does have internal drills.
I would say that #2 still sounds like the first Tetsuo: The Iron Man. The first person to infect the guy was a woman who was full of all sorts of drills and unpleasant appendages. I was not ready to see that the first time I saw it.
Here is a link
to very NSFW scene (you have to sign in to YouTube to watch it).
Both are good suggestions. Due to a description I found for "Steel and Lace," I believe it is the movie being sought. The woman dies after being raped and her brother turns her into a cyborg killer. She goes after one of the men who raped her, seducing him, and they are about to have sex when she kills him with a drill from her body. That sounds exactly like the scene described.