I like to taste my partners' cum or precum. When he comes in my mouth, I often swallow.
But I tried to taste my own cum when I jerked off, and I didn't like it at all.
Once my partner sucked me off, he didn't swallow but kissed me and let me taste my own cum, I suddenly couldn't help throwing up.
Since then, I do my best avoid tasting my cum, but I never vomit again even if I taste it by chance.
I don't really know the difference between my cum and that of my partner's, but I don't like the smell of my own cum. I guess it might becuase I don't like the smell of cum after I have come. I always come after my partner, maybe if I come first, I won't like the taste of his either.