Literotica

If you want written erotica, Literotica is the default and has been since 1998. It is an enormous, completely free archive of reader-submitted stories sorted into dozens of categories and kinks, with ratings and comments so the good stuff floats up. Over the years it has grown beyond text to include audio narrations, illustrated works and poetry, but the core draw is the sheer depth of free written content — you will not run out. Because everything is user-submitted the quality swings from genuinely excellent to rough, and the interface is functional rather than pretty. None of that has dented its status: for free erotic fiction, this is still the first and biggest name.