YouTube prohibits explicit content meant to be “sexually gratifying”. Other content, such as sexually suggestive material or vulgar language, can be age-restricted and cannot be watched by anyone signed out or under 18. For children under 13, parents can set up supervised accounts set to “Older kids” (9+), “Teens” (13+) or “Older teens” (16+). Such supervised child accounts should never show explicit sexual content, whatever setting a parent picks.