Here's what I like to imagine is going on in this:
"Ah! There's my handsome boy, awake again at last! Mommy saved you, you're all right now! You passed out from the heat! But I knew sex would help you sweat it out of your system!"
*winks flirtatiously*
"Good thing I'm on birth control, or I would be growing quite a lot bigger over the course of the next year, if you know what I mean!"