Returning condoms shows a certain level of disappointment and finality, don't you think? This guy could have easily saved them for another day, but instead those unused wang wrappers were just a constant reminder of his sexual failures. 
The condoms are so depressing he can't even have them in the house. 

Via Twenty Two Words:

A Mississippi law passed in 2012 restricted teachers from teaching condom use in sex ed classes. In response, educator and education reform advocate Sanford Johnson developed a simple (and pretty funny) workaround.