You're missing her point.
Yes, if you're in a relationship, sex is part of it and something both people typically want. But many people (men AND women) just go out to score butt and aren't looking for companionship outside of the sexual aspect. Or you get women (and it's mostly women) who entice a guy with sex, thinking he'll fall madly in love with them, and then get all depressed when he says, "Thanks for the boot!" and runs off.
So Tshow's statement is correct, and more people should think that way, in my opinion.
you're a sweety pie ~ how old are you if you don't mind me asking?