Bis-phenol A, or “BPA”, is everywhere. It’s a chemical commonly found in plastic bottles, like those holding sodas and water. It leeches out from the plastic container, and seeps into the drink. To the body, it looks like the female hormone estrogen, and may throw male hormones out of whack.
Mounting evidence suggests that BPA is bad for sperm, slowing the soldiers and lowering their numbers. Look for “BPA Free” on bottles if you want your sperm to be the best that they can be.