Seawater with a touch of that white glue you use at school.
Theres only one way to find out..Actually theres many but each involves you tasting it.I'm sure can find some volunteers.Guys cum can taste different from each other like womens vaginal secretions can vary in taste.It depends on diet,health,smoking, hydration(water)....What they say is true,,"vegetarians taste better".One time I went on a vegetible only clean diet for a little while,minimal fried food,minimal coffee etc.,,and my girlfriend said that I tasted better than normal..Try some samples and see,rather,taste for yourself...
It all depends on what the guy eats...if the guy eats chocolate then it will sord of taste like chocolate. I have never told a guy to eat a certain food before, but my sister told her bf to eat strawberries and he did and she said it tasted better that normal because it had a strawberry flavor...try it sometime...