Chanukah is an opportune time to work on sexual purity. Here are some excerpts from an article by Tzvi Fishman.
At the center of the Greek plan to uproot the Torah from Israel was their strategy to lure the Jews into sexual transgression. The Jewish People's belief that G-d ruled over the physical world, as well as the spiritual, was something that the hedonistic Hellenist culture could not allow....
...Craving to be like the Greeks, the Jewish Hellenists stretched their orlah [foreskins] back over the sign of their Brit, in order to look like their masters. Enraptured by the tantalizing synthesis of Greek intellectuality and unbridled bohemianism, Jews abandoned the synagogue and study halls, adopted Greek names, dressed up in Greek tunics, flocked to Greek theaters, bathed in Greek spas, and drank alongside the "enlightened" foreigners in their pornographic pubs....
...Mattityahu and his five sons rose up like lions against the enemies of Israel and G-d. When the Greek governor sent an officer to erect an altar in Modiin and force the Jews to sacrifice upon it, Mattityahu rushed forward to slay him. The "Book of the Maccabees" relates:
"Thus he showed his zeal for the Torah, as Pinchas had done toward Zimri, son of Salu. Then Mattityahu cried out in a loud voice in the town, saying, "Let everyone who is zealous for the Torah and who guards the Brit [covenant - sexual purity], follow me!"
In Mattityahu's very first cry to battle lies the secret of Hanukah.... As Kohen Gadol [High Priest], he was entrusted with guarding the sexual purity of the nation, as it says regarding the Kohanim [Priests], "For they have observed Your word and guarded your Brit" (Devarim, 33:10). Zealousness for the Torah and guarding the Brit go hand in hand. Thus Mattityahu's cry to war was, "Let everyone who is zealous for the Torah and who guards the Brit, follow me!"
The Zohar teaches that as long as Israel is free from sexual transgression no rival nation can rule over them. "Rabbi Elazar said, As long as men remain attached to the Brit and do not loose their sovereignty over it, there is no nation nor language in the world that can do them harm" (Zohar, Bereshit 66b).
This was the secret weapon of the Macabbees.