If your spouse has taken to dressing better than usual, sexier even, but whose libido is still not quite up to scratch, you'd be forgiven for thinking that he or she might be seeing someone else.
You might be right. Or, you could be terribly, terribly wrong.
It might be that your sartorially-improved other half has started a job outside the home, and suddenly has an excuse - nay, the opporTUNity - to wear something other than a thermal undershirt, a faded black tee and a pair of jeans with dying Lycra. It might be that your spiffier spouse is still too tired for sex though.
In which case, at least you can rest assured that you aren't being cuckolded.