Answer:
It is considerer unethical.
Explanation:
While performing an experiment or research, the people carrying it out have the moral obligation to ensure the subject's physical and psychological well-being above all else.
When an individual takes part in an experiment, he/she trusts the investigators carrying it out so hurting them is considered unethical.
There have been instances in the past where the subject's well-being was not taken into account, such as the Little Albert experiment, which left an infant traumatized just for the sake of research.
This is why nowadays there is a moral and ethical code under which experiments operate, <em>ensuring the psychical, emotional and psychological safety</em> of the individuals taking part in the research.
