We originally issued our "What Happens in Storytime Stays in Storytime" t-shirt for kids only, but we got dozens and dozens of requests to issue it for kids of all ages. So we are now selling an adult version.
If you're wondering why we don't sell more shirts in women's styles, it's because we have a limited amount of space to store our inventory, and a limited amount of money to buy it with. We considered doing women's-only for the Storytime shirt, but the affordable women's style only goes up to XL (which is fairly small in women's sizing) and we wanted to be able to accomodate everyone. Moreover not every woman wants a form-fitting shirt. If we don't have what you want please let us know so that we can try to do better next time around.