Sex File: I want my girlfriend to surprise me with sex

'The "up all night" sexual intensity experienced at the beginning of a new relationship is unsustainable if you have to work for a living'

Scheduling sex gets a lot of bad press but there are upsides to knowing that Saturday morning brings lazy sex.

Q: "My new girlfriend introduces the idea of having sex by saying, 'We should have sex later.' It's such a turn-off and makes me feel as though it's a 'should do' rather than a 'want to'. Am I being unreasonable?"

A: Long-term sexual relationships are always a mix of "want to" and "should do". In films - and personal fantasies - sex is a spontaneous eruption of desire that simultaneously possesses two very attractive protagonists.