Hi Kevin

It may not be the word/term you're looking for..........but yes, desensitization can fit.
That can also refer to a "numbed pleasure response", as in addictions/addictive behaviours............so unless you find a term closer to what you were trying to think of..........you're right, desensitization can fit

But..........is this behaviour something we can maybe try to help you with.......if you want to talk a bit more about it.............we can try

Alison