A red line through an explicit track would help indicate that the track is not to be played, especially helpful for people who are using your database.
Comment on this feature request:
Jason Allen commented
Hi Mike,
One could argue that these tracks should not in your database at all. It is not possible for PlayIt Live to know which tracks are explicit unless you have tagged them as such. If you have them tagged then you can create a track group to categorise them and set a colour or icon that would suitably indicate its explicitness.