Car
One day Pepito was having a shower with his father when he saw his fathers penis.
He asked his father what it was and his father replied "this is my racing car".
The next night Pepito heard moaning in his parents room, being curious he peeped in to see what was happening.
He then saw his father on top of his mother, while looking his father saw him and told him to go to his room.
"OK, but I'm not sure you're driving that racing car properly" replied Pepito.