darlingcat wrote:There was some kind of pleasure or release in that scene. here is the visual to odm's comment

My take on the sexual thing: Giving in to his urges of killing must feel kind of orgasmic to him, as he's struggling with it and is driven to do everything a certain way on that particular day. He just can't stop, and finally, when the deed is done, the urge relents and he might feel like breathing after being suffocated. Just my take on this, I'm no profiler or something.
And I see certain things in his behaviour as being very insecure in his sexuality. He saw his mother sleeping with other men, and he saw his father kill her for that. So sex must be something for him that will be punished severely. He lies in bed with so much tension, his hands on the blanket like they are handcuffed by his compulsion, his clothes plain and totally encasing him. There's nothing remotely free or sensual in his way he sees his body. He can't even stand to see himself in a mirror much, except for that short scene where he jokes with himself (eerie, as it's a bit out of character and that makes it all the more striking - he's not one-dimensional, not even in his OCD).
He even takes another pair of slippers to the bathroom, so I guess everything having to do with bodily functions must be dirty to him. Even his meals are sanitized, wrapped in saran, white, tasteless. He doesn't use any ketchup or sauce, it would stain. He eats standing up, as if he was ashamed he even had to eat.
So, I can't even imagine him ever having a sexual reaction without feeling tremendous shame and guilt. When Alice comes on to him, she is a threat to his precarious sanity, he has to get her out of his meticulously clean home, and when she doesn't go, he gets more and more agitated. I think he killed her not only because she recognized him, and endangered his plans for the day, but also because she was so full-blooded female. He felt threatened by her.
Excuse my ramblings.