Why didn't you just simply invited her to discuss the things further in front of a drink in a more intimate space?

I'd rather people actually said "Do you want to come back to my room for sex?" rather than "Do you want to come back to my room for coffee?" where coffee is a euphemism for sex, because some people will take coffee at face value, which can lead to either uncomfortable situations, including fear of assault, or lead to people missing opportunities because they are bad at reading between the lines.

Or if you do want to invite someone for a drink, go somewhere public.

Edit: I'm not saying that people should go round propositioning people for sex without getting to know them first. I'm saying that drinks in public are good, and that I, personally, prefer to think that adults should be able to say what they mean without euphemisms. I'm not saying that I get to ignore societies' rules. And I realise that people find what I have been saying creepy, but personally, I think if I was a girl I would find it very creepy that there could be situations where I'm in a private room with no witnesses and I want to drink coffee and the guy expects sex.