When I was in middle school and first learned about gay men I thought one penis would have to open up somehow to accept the other penis as what I now know would be called sounding. Also knowing what I know now that would be pretty extreme even for sounding but I was a preteen fundie and had gotten all my sex ed from an anatomy and physiology book in the family library with 0 direction from any adult so in the absence of any better ideas that seemed like the most likely way that would work out. Anyway this is a great example of why puritans wind up so kinky; you have no idea what normal sex looks like so you just have to imagine it and sometimes the imagination comes up with some really weird shit and before you know it you're having preteen wet dreams about stuff the human body doesn't even do.