I also wonder how they endure the stress of constantly keeping the other relationship secret and preventing their regular partner from getting suspicious.
And what about the extra expense, if you're barely solvent as it is? The hotel rooms, the restaurant meals, the travelling around, the presents.
I've never had any desire for a clandestine affair. Not just because I'm very happy with my existing partner but because I'm a fairly straightforward person and deceit and subterfuge doesn't come naturally.
When you're putting all your effort into maintaining a long-standing relationship, surely putting a similar effort into a bit on the side must be totally exhausting?
But it seems to be amazingly common. You can't open a newspaper without reading about someone's affair. Or some randy Don Juan who's had one affair after another for decades.
What's also intriguing is the very different attitudes of the person who's been cheated on. Some go completely crazy, physically attacking their partner, destroying their clothes or possessions, even walking out. But others shrug their shoulders and accept that their partners will never be faithful so they may as well get used to it.
I've never been tempted into infidelity. There was a woman once I was strongly attracted to, but I quickly decided that the damage it could do was simply not worth a bit of furtive and possibly disappointing sex. In any case, she was much younger than me and wouldn't have been remotely interested.
A bit on the side? Not for me, thanks.