A man blindfolding a woman (Getty Images)

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Most of us accept that it's natural for a relationship to change over time (research suggests the initial excitement stage lasts for 18 months) but that's no reason to let things get stale.

Surprise your partner with tickets to an event you know they'll love - and hide them somewhere unexpected for extra fun. If money is tight, blindfold them and drive out to a remote beauty spot for a romantic picnic. Spontaneity and surprise are natural aphrodisiacs, so who knows, you might be using that blindfold again before the end of the night.

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