People who are into step sibling porn — did you grow up with a sibling (or close relative of a similar age) of the gender you're attracted to?

I have a pet hypothesis that, on average, those into step porn are more likely not have grown up with a sibling of the gender they fancy. I reckon those of us who did are more likely to repelled by anything alluding to incest.

People who grew up with ACTUAL hot step siblings notwithstanding.