What do you mean by “eating out”. I have learnt that by modern orthodox, “eating out” has a very different meaning than what chareidim mean when they say eating out.
I heard this from someone who was a new Rebbi in a MO school. He was surprised to see that the students were shocked to hear that this rebbi would “eat out” in a restaurant with his wife. His surprised was removed when it was explained that eating out meant eating fish in non-kosher restaurants.
Apparently it was not uncommon, but they saw that their Rebbi was not MO, and surprised that he would “eat out”.
He quickly corrected their misunderstanding about where he would eat.
However, I think you have to define what you mean by “Eating out” for the many non chareidi posters.