I didn't say we weren't a binary sex species - the point I'm making is that it's more complicated than every person born can be immediately identified as a male or female straight away. Such a supposition isn't true. That doesn't mean there's a third sex, it means there's a complicated relationship between the two binaries that isn't immediately evident at first glance.
I don't follow how such an observation would lead me to be a Mens Rights Activist. I attempted to read Clare Graham as you recommended, but I found a lot of it very difficult to follow and somewhat vitriolic. Perhaps I picked the wrong article as it seemed to be a lot about Helen somone or other who seems to be entirely unpleasant.
I will look again when I'm less tired - thanks for commenting.