Why do people cuck themselves like this? He's begging for BBC to come fuck his wife!!
It is probably because the husband is a porn addict and is desperate to be aroused and somehow have sex with his wife, and he thinks her being fucked by other man will arouse him enough to fuck her.
Cases like these are often mentioned when it comes to husbands being porn addicts and not knowing that the porn addiction is real. He is just trying to arrange a scenario he sees often in porn, thinking it would be somehow good, failing to realize that a wife usually wants to have sex with her husband only because of the connection. And the stupid husband let the connection to be eroded by sustained porn use.
I can't think of any more plausible cause of the cuckoldry than porn addiction. Because what else would compel a formerly self-respecting man to do think of such degrading and shameful things like cuckolding.