I will never tell your wife we have sex, a woman tells her neighbor

I am a 30 year old man with a high sex drive. I want it every day if I could get it, but my wife is happy with two or three times a week. Once in a while, she humours me by letting me have more, but I always have the feelings she does it for peace.
Few weeks back, her father had a stroke. He’s lived alone since he lost his wife some years back and my wife had to go to the family house every evening from work. By the time she came back home, sex was the last thing from her mind.

In the meantime, our neighbor, who is a very good friend of ours, is a single mother of three. She’d jokingly complained of abstaining from sex due to no fault of hers. So when discovered I was alone, she went back to her place to bring me something to eat. I provided the booze.
One thing led to another and I found myself having amazing sex! She’s in her 40s but sexy and very athletic. Afterwards, she suggested to he her place from time to time for no-strings sex. She said it would solve both our problems and my wife will never know.
I’ve taken her up on her offer and the nice arrangement is working for both of us. I mean what could be simpler and where’s the harm?
I love my wife and our beautiful children, but not getting enough sex is driving me up the wall. Could this be a way of solving my problem and my neighbor's?