The group increasingly focused on the suppression of sexual desire; Applewhite and seven others opted for surgical castration. They initially had difficulty finding a willing surgeon, but eventually found one in Mexico. In Applewhite's view, sexuality was one of the most powerful forces that bound humans to their bodies and thus hindered their efforts to evolve to the Next Level; he taught that Next Level beings had no reproductive organs, but that Luciferian beings had genders. He also cited a verse in the New Testament that said there would not be marriage in heaven. In addition, he required members to adopt similar clothing and haircuts, possibly to reinforce that they were a nonsexual family.