spousal eunuch
A spousal eunuch is virtually identical to the 'spousal unit', but without the sex. Unlike ordinary eunuchs, spousal eunuchs usually have existing and potentially functional genitalia, but have stopped fucking their significant other for reasons which do not pertain to physical endowment.
I've been banging this married chick because her spousal eunuch can't get a boner without first being subjected to sexual domination. How refreshing it must be for her to get laid by a dude who doesn't have a ball gag lodged in his cake hole!