Sorry but because of all the stupid chatter and accidental calls too company on 121.5 I turn it off now, particularly when flying in the UK (where at least it's used for helping lost 172's) and China (where god-knows what they are rattling on about).
I can't hear what's happening on Sector or Approach on VHF 1 with all the yakking going on on VHF2 so I turn it off. Sometimes I have forgotten to turn the volume up again when I leave that airspace.
That's defeating the whole purpose of a 'guard' frequency.
Use 123.45 for silly football score chat and leave 121.5 for the maydays.