"Sleeveless" by Joy Brozek

What is the main idea or theme of this story?
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<Tab/>This is an introduction, the theme is at the end. If you prefer to be lazy, skip the introduction. I prefer you read it though, it helps you understand the theme.
<Tab/>Jenny and Lisha loved the garden, the dirt garden where they used to play when they were children. But they grew up, taking the garden into themselves. An internal garden. They both became interested in boys. And as Lisha put it, "Teenagers are lust automobiles." Jenny soon became pregnant. (the baby is a flower, metaphor u…