was the May/June review a thing already in 1711, under F1?

I have no idea. But I do think that in the F1 era, SD used to travel with him when he travelled, as they were both under pressure to produce the next heir. (See also Grandpa F1 marrying again just in case they didn't manage.) Plus even in more normal marriages, a young couple usually has more sex with each other than a long term one.