Hello,
I think it's a good idea for a short film, just make sure to work the logic... if the man can't have an erection, porn isn't a solution. Maybe it's just because he can't have an erection for his wife that he needs porn.
Avoid the word "man"... be more specific.
Make clear what is the inciting event - the wheelchair or the wife snobbing him?
and make clear where is the source of conflict (or there is no story: a man is snobbed by his wife, he watches porn -end of the story) ?You can make the logline shorter, something like:
"When a conservative teologist on?a wheelchair is snobbed by his wife, he'll find that to acces porn isn't easy as he thought", if the story is about a man on a wheelchair who need to access porn (visually, what action take place in the story).
Psychologically, I won't put the blame on the wife, maybe it's the man who feel unconfortable on his wheelchair and feels like he can't love anymore, like he's inadequate (a more complex character).