Does consuming caffein adversly affect fertility and how much is considered a safe amount to consume while trying to fall pregnant for male and female?

Dose dependent. No one knows for certain. Like most toxins, the more caffeine the higher the risk of problems. No one knows for sure if there is a 'threshhold effect, ' below that amount there is no impact. I usually counsel patients that one caffeinated drink per day is unlikely to have an effect on fertility.