The Naturally Horny mod is pretty straight forward and simple: It aims to create a natural cycle of Sexbound interactions with NPC's. NPC's will slowly grow horny over time, and eventually will use sex-enabled beds on their own, including crew-members. I mean it, crew-members getting horny is a big problem during exploration, because of tables! Once in bed, they will only leave once they've had enough, or by using the books from Lewdbound, one can make them stop being horny.