Because he only comes once a year!
What do female reindeer do when Santa takes the males out to guide his sleigh?
They go into town and blow a few bucks.
Why doesn't Mrs. Clause get pregnant?
Because Santa only comes down chimneys!
What do you call a penis wearing a Santa hat?
Jolly Old Saint Dick
Why did the snowman have a smile on his face?
Because the snowblower was coming down the block.

happy ho-ho-holidays, friends (and fiends)!