They're both grownups, and Bond isn't married. There's no reason he has to divert M from going into the bedroom, or for the girl to hide in the closet. He hasn't taken a vow of celibacy.
shareThey mention that she’s a foreign agent (I forget which nationality). M asks James if he’s heard from her. So while not the end of the world to have slept together, it’s likely not good for their respective careers if their superiors find out they’ve been up to ‘nocturnal activities’ with each other.
shareShe was an Italian agent and it wouldn’t have reflected well on MI6
shareIt's because M's his dad innit. To be revealed in the next Daniel Craig adventure...
shareHe doesn't want M to join in again
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