I had a blowout on the freeway a number of years ago and got safely to the side of the road. I had three children with me, all quite young, with one still 'riding the hip.' We stood outside that stranded car for over an hour and N

NE stopped to help -- and there were plenty of cars with Christian decals that drove by. I was wondering just how dangerous a woman with three little kids looked!
I deeply appreciate the men who have helped me when I needed it. This includes plumbers, who actually come to the house while I am alone here (shock!), the window repairman, etc. etc.
If there is evil going on between any two people, they most probably will NOT be having lunch together in public! It's pretty obvious when you look at two people in public whether or not they are simply discussing whatever or if they are cozy.
If it is a purely social lunch, and both spouses know about it and it does not bother either of them, then what's to worry? If it is a business lunch, then what's to worry? If, however, it is not business and one or both of the other spouses is not aware of the lunch, then there is already trouble in River City! The lunch may only be a symptom!
Dinner is different. It is the end of the day when people start to relax. If you are married, do your relaxing at home -- your own home! Unless, of course, your spouse is with you.
And, of course, one lunch one time is a whole lot different than a regular series with a member of the opposite sex who is not your spouse...