Why do women expect relationships out of fuckbuddies/casuals?

RJGraveyTrain
I always see these types of questions from girls, and have had friends and acquaintances who have fell into this "issue."

Girl friend: So RJ, I like this guy. But, he says he wants nothing serious. Just sex and stuff.
Me: K. And what do you want?
Girl friend: I want a relationship! What do I do?
Me: Move on to a guy who wants a relationship.
Girl friend: BUT I LIKE HIIM! If I have sex with him, do you think it'll make him fall in love with me?
Me: No...
Girl friend: WHY?
Me: Because he literally just told you he wanted to fuck and nothing else. Clearly he doesn't see sex as an emotional and loving process.
Girl friend: BUT WHAT IF I GIVE HIM THE BEST SEX EVER? AND LIKE SHOW HIM THE WAY?
Me: ... You're an idiot.

Seriously, I don't understand how men can bluntly say that they want absolutely nothing serious, no titles, no strings, just casual hangouts and sex, and women act surprised and hurt when they don't want to enter a loving, exclusive relationship. You knew this going in, so why did you bother? Is it because you weren't intending to fall in love but you just did? Or did you hope you could actually change his mind? What is the thought process here?

I mean, to me it's common sense: if a guy wants something casual and you don't, you don't get together. That's what I've always done anyways.

Everyone is free to chime in with their theories.
Why do women expect relationships out of fuckbuddies/casuals?
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