Is an increase in penile length cause for concern?

According to trends in male reproductive health data, sperm quality and testosterone levels have declined over the last few decades, sounding alarm bells for Michael Eisenberg, MD, a professor of urology at Stanford Medicine. It’s made him wonder: Should we be concerned about other differences in men’s reproductive health? Surmising that there may be more to uncover, Eisenberg set out to determine if physical anatomy has changed.