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.
There is no equivalent because women are culturally allowed to enact both gender roles without taking on shame.
The shame a man is assigned when he either adopts or is cast into the feminine role is a asymmetrical aspect of our gender culture.