Likely he just prefers numbers that are somewhat equal, which to be fair is not out of the ordinary. They're already quite skewed. That said, I don't care either way.
That's really the truth of it.
I will say that, in my experience, group games almost never produce smut unless they're specifically designed for it. And when they do, it usually kills the game. Thus, like you, I don't particularly care about the gender ratios. Not that it matters what I think of it, since it's Pen's game after all.