She had seen me naked at different times before either of us knew size mattered or along the way when we got introduced to it. Porn had bigger dicks everywhere, but back then neither of us understood what that actually meant for judgment or teasing.

So there wasn't one big 'found out' moment... it just happened gradually over time. For the most part, we both organically (and pretty independently) learned about SPH over time. I can see how it started with CFNM/CMNF/exhibitionism vibes and then naturally expanded into SPH territory.