Dear LIB readers: My boyfriend only proposes during sex

From a female LIB reader

My boyfriend only proposes when we are making love...in the heat of a passionate moment he says things like 'let's get married', 'marry me', 'when do you want to get married?' But once we are done, he doesn't mention it again ...and I'm too shy to bring it up. What should I do?

via LindaIkeji