In mythology, there are usually multiple accounts of myths and not all of them agree. Egyptian Mythology is a great example where in some myths deities will show up as brother and sister and then mother and son and even husband and wife. Some of the myths overlap and have them as both siblings and couples, which shows a particular trend that is not uncommon in mythology. The trend of incestuous relationships is in Egyptian, Greek, Norse, etc. mythologies.
Greek mythology likewise has a convoluted family tree where in some cases Hera is said to be Zeus's sister and yet is also known as his wife.
Greek Mythology is split into ages based on who was ruling. Such as the age of the giants, then the titans, and then the gods. To act as an antithesis with paganism, the earth is not wholly good and nature is temperamental at best. The many gods are often at odds with each other, which explains bad weather and crop failures. With temperamental gods, the importance of prayer and sacrifice went up. The belief that because a superior being existed, the life had a bigger purpose is shown in the number of hero stories.
Like Greek myth, Norse myth centers around a pantheon of beings called the Aesir. These beings are less troubled with mortals and instead go on their own adventures and stir up trouble with other gods. In this mythology, the giants and gods live somewhat in peace. Unlike Greek myth, the beings are not all related, so incest is not as rampant as in Greek mythology
With relationships causing troulble in both greek and egyptian mythology, the existence of virgin gods and goddesses are few and far between.
Hestia
Athena
Artemis
