LOL, no doubt they know about your prowess in the kitchen as well as the boudoir. Steak & BJ Day is the tongue in cheek answer to Valentine's day cerebrated a month later. Where as a woman may want flowers, chocolates and serenading on Valentine's day, all a man wants is a steak and a bj (sorry for the stereotypes).
Pi day is March 14th, which numerically is 3-14, which is suppose to represent the numerical value of pie 3.14......etc. You're also encouraged to eat some pie on this day