A few years ago I went to a PR launch for a sex thing. Alongside the free champagne (woo!) there was a discussion about ‘obligation sex’ – whether you should make yourself shag sometimes even when you’re not in the mood, to keep the spark alive in your relationship. A sex blogger who I respected a lot was there (she, along with the free champagne, was what tempted me out of the house), and during the discussion she argued that you should have obligation sex. That making yourself shag could be the glue that held your relationship together even when other things were falling apart. I remember being shocked by her answer, because my gut instinct was to disagree. But I really liked her, and there’d been a lot of free champagne, so all I left with was a fuzzy head and a vague feeling that ‘obligation sex’ didn’t sound like much fun at all.

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