This is true, but its not that simple. When you're in private, its a far more dangerous situation, and, for instance, some girls will be scared to say no because of the possibility of violence.
She will be even more afraid to say "no" while in private if she beforehand explicitely said "yes" to sex instead of having said "yes" to coffee.
If you ask: "Do you want to come to my room with me to have sex" and she says "Yes", that can be interpreted as a promise to have sex if the girl comes to the room. Asking for "coming to the room to drink coffee" doesn't do that to the same extend.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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