Letty and Sean Hotel Scene
That wasn't rape, and it's pretty obvious.
It's easy to see the chemistry/foreplay in the court before the hotel. Sean touches her intimately, and even calls her a *strawberry* which is slang for a prostitute who will do anything for her drug. Which in Letty's case is drugs, alcohol and sex. As much as she accuses Sean of not changing, she also hasn't changed.
We know as far back as the first episode, that Letty follows setbacks, with extremely bad decisions, because she is reckless. Instead of doing meth in a hotel room, she grabs a bottle of vodka, takes her clothes off and and doesn't bother with covering the window. When Sean walks by she opens the door.
What follows is staring in each others eyes, slapping his hand away in a sexual and twisted manner. And the same instincts that have her wanting to kill him, is the same that have her wanting to have sex with him. After having what is obviously animalistic sex, she wakes up the next day, hating herself, for giving in to all of her base desires. She even goes as far as trying to wipe herself clean of him.
As warped as it was, this scene pretty much sums up the entire series.