There is a hell of a lot of 'fan art' dedicated to this theme on the internet:
This was just about the least explicit i could find.
And these i found on a German site, so i couldn't really understand what was going on, but i swear he's meant to be pregnant in this one:
And here are the happy couple with their new born child, from the same site:
What kind of a person actually makes these type of pictures, that is one creature i'd love to see.
You probably would though...