You know how there are so many design in the world where you can look at it and say, "a man designed that." This one is the opposite. I look at this and say, "a woman designed that." You see, men generally don't like anything that has a target right by their genitals. It's something we actively avoid, whether we're aware of it or not. It's like it was built in our genes the same way a baby bird in the Sahara knows not to walk too close to the waters lest it wants to be an alligator's meal.
To be fair, two women would have no problem playing on these chairs simply because they'd know how to do it properly. If two guys sat in those it would only be one or two kicks before they were firing rockets at each other's faces, trying to hurt each other.