Headspaces: A Clinical Observation

I'm in my twenties, a trans man exploring the role of Daddy in intimate scenarios. The headspace transition feels almost like muscle memory by now, triggered during physical intimacy. There's no emotional attachment here, it's pure clinical observation and performance. I provide care and affection within this space as requested, but that's it. Is there any specific literature on why regression can be therapeutic for adults? How common is this type of headspace among adult practitioners?