Deadbedroomers (a.k.a. husbandcels; marcels) are real incels
Well, there are these incels (sometimes just nearcels, depends) that are called "deadbedroomers" (dead bedroom + -ers), "marcels" (married + incels), "husbandcels" (husband + incel).
There are millions of naive girls and boys who think that marriage means "end of the inceldom" and "sexual activity forever" but it's not everytime the case. There are many sexless marriages. So, a deadbedroomer, a.k.a. marcel, a.k.a. husbandcel is someone who is in a sexless marriage.
The reasons are that Sexual activity in married couples is nearly always bottlenecked by the wife due to women having an overall lower sex drive and the wives losing their sex drives much sooner than the husbands, with there evidence being this is especially the case when cohabiting rather than living apart and when the man isn't the main breadwinner (by proxy of having higher education status)... (Different from women, men face a higher chance of remaining sexless when they provide less than 20% of the household income (aOR = 2.27, however only at p <.05).)
There can be many problems when you're a husbandcel (marcel): feeling like a real loser, decreased self-esteem, anger and bitterness, irritability, decline of the physical and mental health, weakened emotional ties and communication problems and misunderstandings, acting like you're just a roomate, lonely and isolated feelings, thoughts of getting a divorce, etc.