Why does his cum taste so gross?

I've only ever been with one guy so I don't know what other cum tastes like but his is something I can't handle. I want to be sexy for him but when I smell it it smells like chemicals and a science project. Like bleach almost. We've tried pineapples (I tried to make him eat a whole pineapple but he doesn't like pineapples) and he's ate pretty well when he was with me for 2 weeks but still!!! Idk what it could be! Def not std/sti tho, we get checked together.