I (man) have a strong fishy smell coming from my crotch. i recently ended a sexual relationship with a woman who I found out was sexually active with other men. I immediately had a full blood test for stds, got a shot and took some pills through the VA.  They said all the results came back negative. Ive never had any smell from my crotch before this relationship. When I shower in the morning it smells ok but by the end of the day it gets real bad.
Welcome. It might be due to excess of perspiration. You can use anti perspiration powder and observe for improvement. Hope this helps