There is a theory expressed by some, especially those who wish to use it to justify abnormal sexual behavior, that people can change sex via reincarnation. This theory has no basis in fact at all.
The male entity carries a positive vibration, the female entity, a negative. Under natural circumstances they can only enter a body that will accept the charge they carry-for the males, a male body, for the females, a female one.
There are rare occasions....VERY rare occasions, when a female entity (or a male one) forces itself into a body of the opposite sex. Such an act is soon regretted, for the entity must spend a lifetime caring for a body that it cannot draw Spiritual energy from.
For all the years that that body lives, the surplus energy that it produces will build up in the field around the spirit, and when the body dies, it will join with its conscious being, producing an entirely new eternal spirit, but one that does not have the long conditioning that will help it to survive like a soul that has evolved through the natural process. And this soul has little liklihood of surviving until another incarnation.
Any Spirit that has ever been through this agony would never attempt it again.
Though the idea of switching sexes is tempting to some, it simply does not exist in reality.

Up until a couple of years ago, I would have answered this question 'no.' Then, one evening my wife and I were conversing with our Spirit Guides, just joking around (a bad habit we have,) when we started making fun of old Zeus and his love affairs with human women. All of a sudden the Old Boy Himself showed up, mad as a hornet!
"Look," he said, "we might not be as high and mighty as your Teachers, and we may have different moral ideas, but we did try to teach our worshippers to be brave, moral, and just. And you have no right to make fun of us just because we're different."
Well, of course the Old Boy was absolutely right, and I had to apologize. After that we sat down and had quite an interesting talk.
It seems Zeus and his associates, like ourselves, were space travellers, who became marooned on Earth. (By the way, if anybody's interested, he was Alexander The Great's father! Alex's mother wasn't off her rocker!) When I asked him what system he came from, he told me "None." They came from another galaxy. They jumped from galaxy to galaxy the way WE used to jump from star to star.
His was a scout ship that went out looking for planets that their people could colonize. I asked him how his ship was powered, and he said, "By thought drive."
"How did it work?" I asked.
"Simply," Zeus told me, "the navigator thought where he wanted to be, and you were there!"
But how the engines actually worked, he didn't know. It took thousands of years to build them, and his crew only knew how to operate them. They were extremely complex. That's why they had only six...two scouts, like his, and four colonizing vessels that could carry three-thousand people, and all they needed to establish a colony.
When I asked him what went wrong with his ship, he was evasive, saying that something had went bad with the engines. But the thoughts I received from him told me that they had been out for some time, and discipline had gotten lax. Two of his crew people were busy doing something else when there was a malfunction in the engines. Result-one very badly damaged ship, and a crew in a lot of trouble.
They took a bearing on the nearest planet with the highest reading of life energy, and headed for it. They barely made orbit when their ship broke up and melted, falling through the planet's atmosphere and settling into the sea as millions of little metal globs.
But the crew managed to escape in landing pods and came down in the mountains of ancient Greece. After observing the natives for a while, they took on the guise of local dieties as a means of providing their needs. The rest is a matter of legend and history.
Perhaps if there is enough interest from our readers, and we have enough space in furuter issues, we can find out more about what actually happened to Zeus and his crew.