Salty. Sweet. Bitter. Metallic. Sharp. Sour. You name the flavor, and there's a high chance your sperm or semen will taste that way one day.
Semen typically has a bitter or slightly salty taste, though this may vary from person to person. Various fluids in the semen give it its taste. Learn.
Semen is the male reproductive fluid, but your swimmers only contain up to 10 per cent of sperm. The rest consists of enzymes, vitamin C.