Losing sensation

Hey everyone, we are looking for some help please.

Mr broom masterbates daily. He has done this since early teens and does it for a combination of benefits - stress relief and the potential to reduce risk of male related cancers. Of course it just feels good too!

This hasn’t been an issue for the past 20 years - we have what we think is a pretty average amount of sex. The problem is in the last year or so is seems as though he is loosing some sensation the more he masterbates. We don’t think it’s age related as it comes back after a couple of weeks of no solo play. This means that whilst he has a lot of stamina (which obvious sometimes can be positive) finishing through straight sex is increasingly becoming a challenge.

We wondered if anyone had any advice? Is this the dreaded death grip? Can we improve things in anyway whilst not loosing the benefits of regular masterbation?

Thank you! Rather alarming that it could take a while to undo and it will take a lot of effort to not play as much. We have a tenga flip hole. Do you think that would help?