Yes, I was talking about my own experience. When I came out to my husband he was understanding but also clear on the fact that he was mono-wired. And little by little, he realised that he actually wasn't, although living mono wouldn't have made him unhappy. So I definitely know that while some people might know they are poly from the start, it's not the same for everyone.
Me: 30F, straight
Seamus: My husband, 32M, straight
Dragon: My boyfriend, 29M, pansexual, married to Fox
Fox: My boyfriend, 29M, homoflexible, married to Dragon