I always felt guilty about having a "worldly" calender in my bedroom instead of the societies one. I usually liked to have something that inspired me hanging on the wall. But the societies calendar was just boring and lame as hell. The later ones reminded me of christian or biblical artwork that catholics used to hang up in their houses.
I usually had a LoTR or Star Trek calendar. Would have loved to have one with bikini clad girls but I think that was out of the question in my house.
Cheers
DK