The four regulative principles are vowed at initiation and are enforced by the community rather than by conscience alone. The dietary rule is the most visible: ISKCON temples run restaurants and a large food-relief programme, and everything served has been offered first. The intoxicant rule includes caffeine, which surprises people. The sexual rule — intercourse within marriage, for children, with prior chanting — is the one most often relaxed in practice and most often discussed. Devotees generally present the four as a package: the point is not each prohibition but the removal of the four things Prabhupada identified as reliably breaking the practice.