Environmental exposures like phthalates and BPA may harm male and female reproductive function and sperm quality.

“whether there's some environmental exposures right a lot of things have changed over the last 50 years and I think you know chemical exposure certainly one of those and there have been some fairly convincing you know pre-clinical studies so you know mostly done in animals that show that like exposure to different chemicals phalates or BPA other things may actually harm you know reproductive function for men and for women as well and so it may be that you know these chemicals you know that are that we're being exposed to as kids and adults or even probably more sinisterly when we're you know kind of developing in utero that may be kind of the most harmful exposure”