OH! Because she doesn't have a penis...of course...makes perfect sense now....
Apologies in advance if I offend anyone. This statement reminds me of an old joke.
Little Johnny and little Susie were playing in the sandbox when little Johnny suddenly jumped up, dropped his trousers and underwear, and while pointing at his penis proclaimed, "I'll bet you don't have one of these!"
Of course little Susie knowing that she didn't burst into tears and ran home crying.
Several minutes later she came skipping back to the sandbox with a big smile on her face.
Little Johnny looking puzzled asked, "Why are you so happy? You don't have a penis."
Little Susie just hiked up her skirt, pulled down her panties and pointing between her legs giggled and said, "My mommy told me with one of these I could ALL of those I want!"
Sorry for getting off track a bit, but humor (even sick humor) is good for the morning.