We had this issue last cycle, and in fact last year we went through a spell of it too. This cycle I don't plan on telling DH when I'm about to O, I will just make BD a surprise, although I'm sure he'll click on, but without me saying "Oh we need to BD tonight btw" it might not be to mechanical for us.
I think it's best not to go into too much detail with our DH's, I think they are on a need to know basis lol