There aren't more lady songwriters for the same reason that there aren't more lady doctors or lady accountants or lady lawyers; not enough women have the time for careers.
“Order is manifestly maintained in the universe... governed by the sovereign will of God.”
“I created Punk for this day and age. Do you see Britney walking around wearing ties and singing punk? Hell no. That's what I do. I'm like a Sid Vicious for a new generation.”