I think we need to consider what is actually 'evolving' here... it could simply be a case of picking up more skills, learning new things. Are you a Dominant if you cannot use a whip or know how to tie knots or how to do safe suspension? Or maybe it is a case of tolerance and experience of things that cannot be 'learnt'. Are you a submissive if you cannot take a slash from a whip? Or is it mindset? In which case, how does one define a dominat mindset? Is a sensual Domme, who prefers to tease her subs with sexual flirtation rather than be stern and distant a real Dominant? Is a bratty sub who contests and argues every command really a sub?
In truth, there is no such thing as 'a Dominant' or 'a Submissive'. We are all on a continuum of traits somewhere between the two extremes and some of us are more towards one end than another. With this in mind, it is easy to evolve because:
- You can learn new skills
- You can experience new pains and pleasures and get used to them
- (more importantly) your mindset can change from day to day and even hour to hour as different things stimulate you. Drugs, food, tiredness, pheremones, proximity to a certain person, the sight of a certain image. Also, as you get older many people become more authoritarian and confident in thier own abilities... in other words, become more dominant (and in many cases more politically right wing as well...)