I'm curious as to what you mean by this. I've heard of bed death before, but not anything specific to gamers.
Gamer guys who are in long-term relationships often follow a pattern. I've never seriously dated a gamer guy but have seen them casually, and seeing this pattern with friends' boyfriends made me get the fuck out before I had to see it play out in my own life.
There's a honeymoon period where they can manage to sex up their partner and also play games. A lot of times the partner will sit with them, listen about the games, generally do all that attention-paying stuff even to a hobby they're not that interested in, which is part of the honeymoon phase for a lot of people with a lot of interests.
But the more their partner tolerates or encourages the video game lifestyle, the more they'll always be diving into something new. The partner eventually stops wanting to sit and watch an 80-hour JRPG that's basically the same as the last seven JRPGs the guy played. It's changed from something new and charming to something that makes the partner sullen about spending relationship time, makes them want to wolf down meals with minimal conversation so they can get back to playing their game or go to bed later than the partner. That's where the bed death starts.
It's exacerbated because when the gamer guy is up late at night, the whole wide world of porn is his oyster. And the thing about porn is, it's so much
easier than dealing with some actual human with actual needs. Gradually the gamer's libido seems, to the partner, to drop off a cliff, he's never interested and when you want to go to bed he's always got one more boss battle that takes precedence. The gamers' lives gradually move to being almost completely mediated through the screen, where everything is easy and you know exactly the conditions to move to the next level.
Efforts on the part of the partner to entice the gamer back into a sexual relationship are met with resistance, or they do pick their sex life back up for a minute and it deteriorates again the next time a new release hits.
The guy is still consuming a huge amount of porn and probably getting off as much as he did before, but now it's always during or right after a gaming session and the dopamine hits have become inextricably linked. Getting off without the screen in front of them becomes more difficult, and the difficulty is annoying and irritating for them, so they'll be defensive jerks feeling like their addiction is being threatened if called out. The partner either accepts that a sex life is pretty much off the table except maybe special occasions, finds other people to screw around with, or leaves forever.