Q. My girlfriend's perfectly lovely until we have sex - then she becomes an annoying girly girl. She either makes these stupid purring noises or calls me pet names and speaks in a baby voice. I don't want to upset her, but it's really freaking me out. What shall I do?

A. It sounds as though you're at the end of your tether, and if you don't say something to your girlfriend soon, you'll find you can't bring yourself to have sex with her at all. She might be acting childishly in bed because a) it's a cover for how shy and vulnerable she feels; b) it's a hidden request for you to be more authoritative with her - she wants you to be the boss - or c) she's simply repeating something that worked with her last lover, and is assuming that you like it too because you haven't set her straight. You clearly like this girl, so do both of you a favour and get real - ask her why she does it. Be careful not to criticise her, though. There's nothing at all wrong with what she's doing - it just isn't working for you.