This one is old, but sort of cute in its own way (not mine, btw):
While camping, 6 year old Johnny and his dad come upon two wolves mating. Johnny asks his Dad what they are doing. Trying to be delicate, his dad says
"They are making puppies", and Johnny accepts that and they go walking off.
A few weeks later, back at home, Johnny wakes up in the middle of the night due to the noise coming from his parents' room. Sleepily, he gets out of bed, and goes to his parents' room. Door being unlocked, he sees them having energetic sex.
Johnny says "What are you doing"
His dad, really embarrassed, but trying to make the best of it, says "Mommy and I are trying to make you a little brother or a little sister", hoping this would make the boy go away.
Johnny says "Turn Mom over, I would rather have a puppy", and goes back to bed.
Kinman