Sex Peak Lookout was named by two Forest Service foresters in the 1920s, reportedly after the topic of conversation that day. Whether or not the tale is accurate, there is no doubt the name has enhanced the popularity of the lookout in the cabin rental program. The L-4 groundhouse with catwalk was constructed in 1948 and staffed until the mid-1970s. It was refurbished and placed in the rental program in 1986.