Determining the relationship between caffeine intake and infertility is crucial, as high caffeine consumption can impact your fertility more than you think. Caffeine is a stimulant found in different amounts in coffee, black and green tea, energy drinks, some soft drinks, and in chocolates.Determining the relationship between caffeine intake and infertility is crucial, as high caffeine consumption can impact your fertility more than you think. Caffeine is a stimulant found in different amounts in coffee, black and green tea, energy drinks, some soft drinks, and in chocolates.