Best thing to do in this situation is check what country the radio is going to be hosted in, then check the related laws regarding streaming music or radios.
So let's say if it was hosted in England and all listeners must be at least 16 or whatever then make a disclaimer saying explicit content, 16+
You only need to disclaim what you can get done for, and you'll go by the laws set in the country it's hosted in.
You get me?