Years Ago i worked for a regional airline flying to remote areas of northern Canada..places with lots of Mining, Fishing, Hunting, and Hydro Electric Kinds of places. Some of those flight down from the edge of, or just north of the arctic would take hours and make several stops. I used to take note of the unusually high number of boners coming off of these flights.
Someone told me once that prolonged amounts of time sitting and perhaps the pressure at Altitude could cause minor Priapism or erection. Sounded Plausible to me.
One late, hot, summer afternon a Fishing Charter came in. It was filled with Giant, half drunk Americans after a week or so fising in the North. This one Guy in his mid to late Fourties...wearing CAMO track pants came down those airstairs with what appeared to be a record breaking Northern Pike in his pants. I could barely take my eyes off of it, only to see the JAW of the young lady greeting the aircraft with me drop her Jaw on the Tarmac at the site of it.
Wow, a real Giant Fish story to be sure!