I highly suggest not using the Stalker Client for Kodi. You could go the 'playlist method' not using the MAC authentication, and use the PVR simple client using Potato TV, and you will see Adults, if you so desire. Chasing 5 or 6 Adult channels on the supported servers that aren't natively streamed isn't really worth it, especially with all the free stuff using VideoDevil, IMO.
I may be wrong as I haven't tested the Stalker Client in a very long time, but the developer didn't code for the way the servers did its parental controls.