This formula boils down to a 36 hour period of time each month. He tracks this time religiously! He can pin point the time within +/-30 minutes, and he lets me know when it is coming, just so I know he knows.
Ironically, this month the time fell right on Valentines Day morning. So he had a lovely Valentines Day.
Now we are back to having hall sex which is where we just say "F-you" as we pass each other in the hall. He is already calculating next months time.
Happy VD everyone!