Dean is obsessed with Castiel’s dick and its activities. Like no one else on the show.
Like it’s his mission to know where it goes and what it’s doing.
And if the writers wanted me to believe that sex was never something between them
they should stop making it the topic of their conversations so often.
Season six Dean is consistently passive aggressively implicating Cas has an inability to perform sexually
And then Cas makes it a point to prove he can perform sexually in Caged Heat.
Sex is something between them.
It is a topic and a point of contention, and a main subject for many of their hostile remarks in season 6.