I was pretty oblivious to BDSM at that time, but 'dominant' and 'submissive' were commonly used descriptors that were almost used interchangeably with 'top' and 'bottom' in online posts. Maybe those dynamics were more at play than I realized, those were often very objectifying experiences (maybe that's just anonymous sex though?). All but one of those guys I met through Craigslist, and they always made it clear what they liked and what they wanted in their post, so I would get with 'masc dom tops' who were looking for 'fem sub bottoms' or something similarly phrased. Just answering an ad sort of implied what one was into, so there wasn't much discussion that way ever in my experience. The one guy I knew from high school was really masculine-presenting, and I guess we both just assumed each other's sexual preferences and interests because we never discussed it. It seems like being GNC led others to assume I'm more sexually submissive and a 'bottom', and to be fair I pretty much always assumed more masculine guys were more dominant 'tops'.