Because a sidekick's role is also being the comic element of a superhero's crime fighting.

Just like many other cartoons, Sidekick is full of Toons&TFs of many kinds; most of these are with the main male characters Eric and Trevor, but since Vana is quite a negative character sometimes she also gets the good dose of spanks she deserves.

I did not watch the entire show, but from the infos in the wiki and the clips I watched I can guarantee you'll surely find pics and scenes like these in it.