Not everyone is either dominant or submissive, some people are called a “Switch”. Meaning they can go either way, they can be the dominant partner or the submissive one. It can depend on their mood, or it can depend on their partner. You may be submissive within one romantic and sexual relationship, yet be the dominant partner in the next.
I can think of one client in particular who will go for months in dom mode and talk about everything from restraints and saw horses you have to straddle on tip toe, to all kinds of naughty dom things he speaks of doing to you. Then for a few weeks he will be totally submissive and want you to talk about being the dominant one to him. I always found him an interesting person, since no one was as much of a switch that I’ve ever talked to as him, the phases he went through as one or the other. Wanting to be blackmailed, sending me pics of him in ladies clothes and high heels to possibly email his wife with, though I think the email addy he gave me that was “hers” was just another made up one that he did to make our playtime all the more real to him.
We all go through periods where we feel more controlling than others and where we want to be the one calling the shots in the bedroom and it can certainly be fun, to be commanding someone to do this or that. Some couples will always be on equal ground and are not into the power plays that can go on in a submissive/dominant relationship. It can make for very hot times when you have the right combination of people involved.