I copped a lot of backlash recently for commenting on a situation like this and I'll do it again because it's what I believe. In situations like this, the man clearly loves and cares for his wife, did everything he could, continues to do everything he can, and she is, sadly, very very ill. The curtain twitchers and the pious peanut gallery will clutch their pearls and moralise and shriek about how he obviously loves sex more than his wife and he should gladly live the rest of his years (limited, as all of ours are, let's not forget) like a monk, ignoring his desires as evil and callous and proof that he DOESN'T LOVE HER ENOUGH or whatever.
I say fuck that. He's not chasing a hot young thing because his wife's grown to be the same age he has and has had his children and he thinks he deserves an upgraded model. He's not ignoring his wife's needs while wibbling and moaning about how she doesn't understand him and he's such a victim and a poor unfortunate soul. He's not even sneaking around behind anyone's back - he's there in public with his partner.
His wife is ill, he cared for her at home until it was no longer possible (nobody who has never been a carer for a sick or elderly person has any right to comment on how tough that is), and now he visits her in her care home every day...and in the meantime, he has found a way to continue loving and living in the other way too, that does not impact on his wife's needs or his love and care for her in any way.
Having to watch his wife's deterioration and his inability to care for her properly would be devastating for him and he will need support as well. And he's not dead, so why do so many people insist that he live as though he is?
Let the spiteful, unfulfilled prudes tut and gossip and judge and complain, they always will, they've nothing better to do. I just feel sorry for them - quite sincerely - because if they think chastity isn't a big deal, then they clearly have no experience of what sex can be, and that really, genuinely makes me sad. (They'll deny this of course, but it's true.)
It's nobody else's business.