Female Ninja Magic: 100 Trampled Flowers (1974)

In historical times, the Shogun family employs a group of Iga ninjas to take over the Akizuki clan's lands. The Akizuki hire the Fumi ninjas, a group of female warriors who enhance their fighting ability with sexual magic such as the "white snake spell". When the Akizuki emerge victorious, Tsukinojo, the leader of the Fumi ninjas, marries Lord Akizuki.