An exhausted 43-year-old man took refuge on an apartment balcony from a woman demanding repeated sex, German police say.

Munich police said the couple met in a city pub and agreed to casual sex at the home of the woman, 47, on Monday.

But when the man had had enough, she barred the door. From the balcony he used his mobile phone to call police who rescued him.

The woman is expected to face charges of duress and false imprisonment.

DPA