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.
Missed connections are always weird, but this is in the top tier of odd. And what's with the sister wanting to see him? Is the sister angry? I'd be angry. But, call me old fashioned, I don't want my v@gina vomited upon.