Related Clues:
- X-rated?
- HBO watcher, usually
- NSFW
- Like most drivers
- Mature blue?
- Fully-developed horse bearing 5? Not half!
- Like films labeled 'XXX'
- Young ___ novels
- Former teen
- Child's counterpart
- ___ supervision
- Grown up friend taking in old city
- Warranting an 'X,' say
- Young ___ fiction
- One may behave childishly