TER General Board
At this stage of my life, as long as I'm treated well and fed what I need,
I feel no compulsion to stray.
I'm accustomed to cooking and thoroughly enjoy pleasing my Gal's palate, therefore she has no need to work in the kitchen preparing my food, to keep me as faithful as my dog. 
Everyone's different, I suspect the variety and abundance of Gals I could easily find in my youth, whether I was already in a relationship or not, allows me to be comfortable and satisfied with one Gal at a time now that I've found my more mature years.
I actually feel bad about some of my GF's I cheated on in my youth, even a few of them that never found out how easy I was behind her back.
Fortunately for me, I've never been the moping type of guy who withdraws from relationships after a great relationship goes down the tube.
I'll admit if my GF decides she wants to move out tomorrow, I'd likely pay for time with ten different Gals before New Years, hoping to get over my loss as quickly as possible.
As she stands today, I wouldn't trade her for any ten tens.
Later, I have a quick and easy Spaghetti Carbonara and Kale salad to prepare before she gets home.
Fortunately I plan ahead, I started my home made bread late last night
after she fell asleep.