How we cite our quotes: All quotations are from Psycho.
Quote #1
MARION: Sam, this is the last time.
SAM: For what?
MARION: This! Meeting you in secret so we can be… secretive.
Marion is saying that she and Sam can't meet to have sex anymore. To Marion, pre-marital sex is wrong and sneaky (or secretive). Her desire to avoid it is what causes her to steal the money. Or, alternately, you could argue that the film sees her as wrong, or bad, because she has premarital sex. A person who would do that could do anything—and deserves to be punished for it. (Sexually attractive and active women do not fare well in Hitchcock films).
Quote #2
NORMAN: Well… the mattress is soft and there're hangers in the closet… and stationary with "Bates' Motel" printed on it in case you want to make your friends back home envious… and… the… other there…
MARION: The bathroom.
Norman is embarrassed to mention the bathroom because it's private and sexy. Marion would be hesitant to mention the bathroom too… if she knew what was going to happen there.
Quote #3
NORMAN: [voiceover as his mother] No! I tell you no! I won't have you bringing some young girl in for supper! By candlelight, I suppose, in the cheap, erotic fashion of young men with cheap, erotic minds!
[voiceover] Mother, please...!
[voiceover as his mother] And then what? After supper? Music? Whispers?
[voiceover] Mother, she's just a stranger. She's hungry, and it's raining out!
[voiceover as his mother] "Mother, she's just a stranger!" As if men don't desire strangers! As if... ohh, I refuse to speak of disgusting things, because they disgust me! You understand, boy? Go on, go tell her she'll not be appeasing her ugly appetite with my food... or my son! Or do I have tell her because you don't have the guts! Huh, boy? You have the guts, boy?
[voiceover] Shut up! Shut up!
Norman's mother, from inside his own head, is berating him for sexual thoughts. Moms don't like sex, supposedly. But is it really moms who don't like sex? Or is it the film itself, which gleefully watches over Marion in her underwear, while also moralistically and punishing her for daring to appear on screen in her underwear?