VIVA – There is surprising news about the size. male intimate organs. In a study published in February 2025, it was stated that long-term male intimate organs erection time has increased by almost 25 percent globally over the past 30 years. However, behind this happy news, it turns out that penis length can have an impact on the problem of decreased sperm count and testosterone levels.
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Launching the page ciencia ZMEOn Thursday, December 11, 2025, research led by Professor Hagai Levine of the Hebrew University of Jerusalem found that in the last 50 years alone, the number of male sperm worldwide has halved. From 1963 to 2018, sperm count decreased an average of 1.2 percent each year. But between 2000 and 2018, the decline jumped to 2.6 percent annually in a sign that the problem is rapidly worsening.
Although in theory only one sperm is needed to fertilize an egg, in reality the body produces a large number of sperm because most of them cannot survive the journey to the uterus. Approximately 40 million sperm per milliliter are needed for optimal fertility.
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If this number is not reached, fertilization becomes difficult. Therefore, as the sperm crisis progresses, it is likely that more and more men will have to rely on assisted reproductive technologies. Researchers in Israel observed that the average sperm count fell from 104 million to 49 million per milliliter, a figure that is already approaching dangerous limits for global fertility.
At the same time, testosterone levels also drop. A 2007 study found that American men’s testosterone levels have declined about 1 percent per year since the 1980s. This means that men aged 60 in 2004 had testosterone levels 17 percent lower than men of the same age in 1987.
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Doctors have been watching this trend with concern for a long time. One of them is Michael Eisenberg, a professor of urology at Stanford Medicine, who wonders if the causes of decreased sperm count and testosterone also have an impact on changes in the anatomy of the male body.
Seeing this trend, Eisenberg suspects that men’s penises may actually be getting shorter. Without a doubt, he and his team conducted what could be called the most scientific penis measurement contest in the world.
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They didn’t take direct measurements, but they analyzed 75 authoritative scientific studies conducted between 1942 and 2021, covering more than 55,000 men. When the data was processed, the surprising results were that penis length actually increased, not decreased.
