The only term I could think of is defeminization.
It seems like most people understand what emasculation is and the things that cause it.
What are some examples of situations that can cause the feeling?
Edit: changed effeminization to defeminization.
Shakespeare used the word “unsex” for this, I think. It’s been a while but maybe Lady Macbeth was an example?
Wow I didnt expect this answer!
“Come, you spirits That tend on mortal thoughts, unsex me here, And fill me from the crown to the toe topful Of direst cruelty!”
Now the removal female qualities is the desire of the character herself as she wants the spirits to remove her feminine qualities and emotions, so I dont know if this would count since the lack of traditional gender traits is a positive or atleast desired aspect.
But great reference, I would never have thought of that.