Somebody recently asked about female somaferans in one of the comment threads, and an important question like that should get a spotlight, so here goes.
There seem to be fewer female berserkers than male ones, in my experience. However, as far as I can tell, there are roughly equal numbers of male and female somaferans. I have noticed that female somaferans tend to more often be of one sort of madspace variety or another. Maenadism is a common form of female somaferan, but women who experience more intellectual types of madspace than spiritual types are just as common. In other words, female somaferans tend to have the kinds of somaferan natures that give them easy access to deep ecstatic spiritual trance states, such as those experienced during Vodoun rituals, or the kinds of intellectual eureka revelations that drive science and other forms of problem solving.
Insofar as female berserkers go, they can be just as dangerous as the male variety. Now, the gangr only enhances whatever strength is already present through changes in body chemistry and muscle use, so male berserkers tend to still be much stronger, even in a gangr. However, this strength difference does not matter as much as one might think.
There were two types of initiations that the berserkers of the old Pack used to use. Trial by fire was one, but trial by combat was another. One of our few female berserkers decided that she wanted to have an initiation ritual, and requested trial by combat, with me as her opponent. It went as most such experiences do, with me just playing with her enough to trigger fear and anger without putting her down. When she suddenly broke through, however, she put me down quickly. I may have been stronger, but her smaller size meant that the extra oomph the gangr state gave to her speed was greater than mine. She rushed in faster than I could react to. While I might have been strong enough still to clobber her even in her gangr rage, she struck with an adrenaline-enhanced power, well placed, that put me down so fast that my extra strength didn’t matter. She jumped on top of me to pin me long enough for a win. I was surprised. I have fought a great many opponents, and there have only ever been two I could not lift off of me. One was a 500 pound sumo. The other was her 160 pound frame. She kept pushing me down with great power and shifting her position so quickly that I could not effectively oppose her.
I will note also that, in the Poetic Edda, Thor boasts of having defeated women berserkers as if this was such a mighty undertaking that even a god might boast of it.