The worst thing s10 episode Fan Fiction did was the line "you can't spell subtext without s-e-x" like that's NOT THE SAYING and that's not what SPN used subtext for! This horrid little show and American television in general hasn't had a problem with putting sex front and center in decades.
The actual saying is "you can't spell subtext without buttsex" because a) they're anagrams of each other and b) it's always queer sex (or really ANYTHING that isn't hetero PIV sex) that's relegated to subtext!
You can have a sex scene on par with soft core porn on network television, provided it's a cis man and a cis woman having boring PIV missionary position sex (god forbid you let the woman be on top! Cassie Robinson you absolute legend).
But you can't even say the word buttsex on the same network! You can hint around it and make jokes and insert throwaway lines about all-male orgies, all revolving around Dean in some way...but if you had any character actually say the word "buttsex" in his presence the world would fucking end.