Postmenopausal wife here.

If she's off her horomone replacement for a week or more sex becomes an impossibility--she's simply too tender.

Other than that I'd say a slight increase in the amount of sex as there's no longer a time when it's off the menu. (The same tenderness problem has always existed from the day before her period starts/the day it should have started {whichever comes first} and the day after it ends.)