Oh, the 1970s, when "Women's Lib" could be commodified by sugar-pushers with products like "BALLS" -- candy to give you courage. The jokes in this ad don't even qualify as double-entendres, more like 1.2 entendres. They make Three's Company gags seem sophisticated by comparison. But that T-shirt, on the other hand: sheer hilarity.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.