Watch the dog humping Kevin in the "First Time" sketch. He's eating cheese which they had to put next to Kevin to get him to stand there, and the "humping" motion is actually Mark pushing him from behind.
Please read the following before uploading
Do not upload anything which you do not own or are fully licensed to upload. The images should not contain any sexually explicit content, race hatred material or other offensive symbols or images. Remember: Abuse of the TV.com image system may result in you being banned from uploading images or from the entire site – so, play nice and respect the rules!