/r/porninfifteenseconds: Porn in Fifteen Seconds - Porn scenes given the tl;dr treatment. - March 11, 2019 - 10:58
/r/15jar: 15 seconds of porn in Jar (NSFW) - This sub is for porn montages that use the entire 15 seconds to resume a porn scene. - March 5, 2019 - 23:49