Wincest is canon
Dean: My favorite kind. What do you think, Scully? You wanna check it out?
Sam: I'm not Scully, you're Scully.
Dean: No, I'm Mulder. You're a red-headed woman.
and then in Playthings Dean says:
Dean: Old school haunted houses, you know? Fog and secret passageways, sissy British accents. Might even run into Fred and Daphne while we're inside. Mmm. Daphne. Love her.
Exhibit A: Dean thinks Sam is a red-headed woman
Exhibit B: Dean is turned on by red-headed women
ipso facto, QED, and post partum... Dean is turned on by Sam.
Sam: I'm not Scully, you're Scully.
Dean: No, I'm Mulder. You're a red-headed woman.
and then in Playthings Dean says:
Dean: Old school haunted houses, you know? Fog and secret passageways, sissy British accents. Might even run into Fred and Daphne while we're inside. Mmm. Daphne. Love her.
Exhibit A: Dean thinks Sam is a red-headed woman
Exhibit B: Dean is turned on by red-headed women
ipso facto, QED, and post partum... Dean is turned on by Sam.