Definition: In this task, you are given a Reddit post as a text. Your task is to generate a title for this text. The title should start with "TIFU by", followed by a situation that caused humor. The title should contain 7-12 words, ideally.
Input: Text: throwaway for obvious reasons. right now i feel like the most awful human being on the planet!

today i was having sex with my girlfriend. we've been together for about two months. my ex girlfriend of one year recently dumped me and i'm ashamed to admit that i still think of her.

whilst having sex my girlfriend got on all fours and asked me to fuck her doggy style. this brought back memories of my ex. when she used to get on all fours it was because she wanted anal. without thinking i slid my dick into my girlfriend's ass and started thrusting. 

she immediately started screaming and pushed me off her, she is morally opposed to anal, so i've fucked up badly! i apologized a million times but she left and went home. she's not answering my calls and the only time she's text me is to say that i was a disgusting pervert.

i've fucked up big time. i'll post updates later :/

TIFU by thinking of my ex during sex!