I think you have a zombie movie idea there.

By the way, can we make “boner years” a new unit of measurement?

In order to achieve erection, blood outflow is severely curtailed, allowing the pressure of blood inflow to do its work. This cuts down markedly on circulation, so important functions like ‘oxygen and nutrient delivery’ aren’t happening at the usual efficiency; but that is endurable for modest periods.

In the case of a prolonged erection, the continued loss of circulation causes tissue to start to die. Loss of local nerves is likely. Eventually, you can end up with a full-on case of necrotic horror penis. 

Honestly, that’s the part that(without further details) makes the ’2-year erection’ claim hardest to believe. Prolonged erections are considered a medical problem after just a few hours, and a serious one within a few days. The stench of rotting flesh, and amputations, and whatnot would likely enter the picture soon thereafter.

I suppose, with the right sort of local nerve damage, he could have a permanent semi-erect state, which is allowing enough blood flow to preserve viable tissue; but has basically trashed function…

On the other hand, as with most legal action, we uninvolved folks don’t know the actual circumstances and are only speculating based on limited info and imagination about what’s probable or reasonable. To wit, the “frivolous suit” by the lady who spilled McDonald’s coffee in her lap actually suffered 3rd degree burns over her ladybits area, and spent two years having skin grafts. So who knows what really happened with the Beemer dude.