Sex on Christmas Eve

Next they're going to tell us that the rabbis don't want us eating kung pao chicken on Christmas Eve, either:

The rabbinic sages behind Nittel Nacht also decreed that a married couple should not have sex on Christmas Eve. I guess they would shudder at all the unmarried Jews today who use the night to hook up at Jewish singles events. (There are similar customs--no Torah study, no sex, etc.--on the ninth day of the Hebrew month of Av, the historic date on which both of the Jewish Temples were destroyed. Ironically, many rabbinic authorities actually suggest this was the actual day of Jesus' birth.)