Thanks for this helpful comment. The back-and-forth that is going on in the subthread below your comment illustrates the difference between "evidence-based medicine" (medicine studied through randomized, controlled trials, which by the way we don't have here) and "science-based medicine" (medicine studied not just through randomized, controlled trials but also through careful consideration of fundamental science). Science-based medicine is rare but important[1] because even clinical trials, if done with small enough sample size and enough researcher degrees of freedom, can produce spurious results, which are all the more convincing because they appear to be backed up by good methodology.

But of course here we don't even have a randomized controlled trial, but only a very poorly conducted observational study in an obscure journal that is implausible on scientific grounds. If there is any association here, likely it results from some coincidental lifestyle association between cell phone use (wherever the cell phones are put) and sperm quality. (P.S. I'm a father of four children, but three of those four were born before I became a regular cell phone user. I'm not worried about this issue for my personal life, at my current age.)

[1] https://www.sciencebasedmedicine.org/about-science-based-med...