No explicit songs show on my music
Check your Restrictions.


Go to Settings > General > Restrictions.
Enter your passcode.
Look under "Allowed Content" for "Music, Podcasts &amp; iTunes U", it should say "Explicit" to the right. 




If it does not, tap on it and enable it.



If everything is greyed out when you arrive at Restrictions, it means they are disabled; I've read people have had some success enabling them, allowing explicit content and then disabling Restrictions again.