But from skinny jeans to meggings, the only thing we know for sure (but not really) is that the world's collective spermcount is slowly being compromised in the name of men's fashion.
Those who spent lots of time watching TV or DVDs - at least 20 hours a week - had a spermcount that was 44% lower than men who spent little time in front of the box.
Since then, over 100 scientific studies have linked low doses of BPA to prostate and breast cancer, reproductive abnormalities, accelerated puberty in females, low spermcount in males, neurological effects similar to ADHD, diabetes and even obesity.
The scientists carried out the operation on 173 infertile men, and on average, found the men's sperm motility and count had improved within three months.