Sex File: I keep fantasising about my husband's friend

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We've been married for a decade and I don't fancy my husband in the way that I did. In fact, I'm drawn towards one of his very good friends and get the impression it's mutual, although I don't think either of us would ever risk our families. Is it wrong to let my husband think he's turning me on when I'm actually fantasising about someone so close?

So far, so normal. Most people who have been married for decades don't fancy each other in the way that they did at the beginning of their relationship. They love each other and they trust each other and they value the life that they have built together, but they don't look at each other and think, 'Phwoooarr, I'd love to get those flannelette pyjamas off.'