worry, on 20 November 2017 - 10:38 PM, said:
It's mostly not true!
Typically the scenario would be a dude is reminded of sex by some stimulus OR his mind wanders towards sex "before he knows it" -- speaking generously -- and thus he'd get a boner in inappropriate times that he might want to claim is accidental or unintended. But that whole process isn't an automatic response, like sweating or whatever...it's closer to normal letting yourself get distracted and being careless (again, speaking generously -- it can also be just plain creepy in certain contexts).
There are contexts where it's closer to reflex, but I am saying if a dude gets a boner at a weird time it's because of what he's thinking, not because of something that has happened to him. And any dude who's like "oops, how did that get there?" is trying to pull a fast one.
This is not true across the entire gender. Inadvertent triggers for erections are rife — anything stimulatory can act as a trigger, sexual or not. And individuals' minimum levels of stimulation to achieve erection vary wildly based on both environmental and hereditary factors.
There's a reason the trope is so widespread.