As Seth Cohen explained in Season 1 of "The O.C." Chrismukkah consists of "eight days of presents, followed by one day of many presents." But we know that Christmas-Hanukkah co-mingling means more than gifts. It should be about "yamaclauses" and holiday cheer and Christmas cookies with melted gelt... and, most importantly, sex.
This year, Hanukkah starts the evening of Dec. 16 and wraps up on Christmas Eve -- which means you have nine straight days to follow our (tongue-in-cheek) rules of Chrismukkah sex. After all, having sex on a holiday is a mitzvah, so we figure that doing it on a double holiday is even more of one.