Okay, phew :) I don't know, I hear/see things so many times and it becomes headcanon for me, kinda of like I think sometimes there's an accumulation of things in fandom or an avalanche of things and then it becomes headcanon for everybody. (Someone had to tell me that no where in the books does it say that Charlie Weasley has any tatoos. This confused me greatly because fandom had convinced me that it was fact, heh.) I'm liking the age gap between Natasha and Clint that seems to be group!headcanon, probably because of the actors ages. I don't think Clint being a virgin until late will be a headcanon thing for me, but yep, fun!

(And that's one of the reasons why I'm loving this pairing: there's little film canon, so we can let our minds wander, yay.)