Including eyeCandy will get your calendar into places that a straight Right to Arm & Keep Bears message would not.
As was discussed in an earlier thread, if you go for the Happy, Pretty theme, and it just happens to include responsile fun with firearms, you can start sneaking the "Guns == Maybe not as bad as I thought" message into people's heads. You will not be able to go over the top with gratuitous gun porn to do this... the Happy Fun idea needs to be stronger than the Girls With Guns idea.
How to pul that off... no idea... I'll let it percolate through the back of my head for a while.