I would imagine that the side effect would be that it could be addictive. I have not had the opportunity yet myself, but I have sucked a couple of cocks in my life and discovered that I actually enjoyed it. I would definitely try eating a fresh load out of my wife's pussy (at least once) if the opportunity presented itself.
My husband cleaned me the very first time I was shared. Yes it is addicting as per him. He has eaten over 500 creampies we've estimated.
He loves it and so do I..
It is addictive. As a bi husband, I love eating my wife’s used pussy, full of warm cum from her boyfriend. She actually initiated me as humiliation, but she knows I enjoy it as much as she does.