Slash writers employ any number of tricks to get their characters in bed. Most involve tearful late-night confessions of attraction, but in one early fanfic described by Henry Jenkins, Kirk and Spock are marooned on a distant planet. According to Star Trek lore, Vulcans go into heat every seven years, a mating frenzy called "Pon Farr." They must have sex or die. Spock goes into heat. Kirk has the choice: Will he sleep with his friend or let him die? He sleeps with him and finds that he enjoys it.