Maven Men

Most men think of their body as operating in real time. Eat well today, feel better tomorrow. Work out, see results in weeks. Sperm doesn't work that way. The sperm that will be analyzed in your next semen analysis, or that will be present at your next conception attempt, started developing approximately 74–90 days ago. That is the window. Everything happening inside your body right now is shaping what your sperm looks like three months from now. This is called the 90-Day Protocol at LEV+LIV. It's not a marketing frame. It's biology. The Science of Spermatogenesis Spermatogenesis, the process by...

Most couples entering an IVF cycle are handed a thick packet of information, injections, retrieval timing, progesterone suppositories, dietary guidelines. Almost all of it is for her. He gets: "Don't ejaculate for 2–3 days before the retrieval." That's it. That's the guidance. The reproductive urologist who founded LEV+LIV has had this conversation hundreds of times in his clinic. The man shows up as a support person. He leaves thinking his only job is to show up on a specific day. That's not accurate. And it's costing couples outcomes. The Biology Nobody Explains Sperm takes 74–90 days to develop through a...

The year was 1960. Dr. Landrum Shettles, a reproductive scientist at Columbia University, was peering through a microscope at human sperm cells. What he noticed would shape how millions of couples approach conception for the next six decades, and what many are still misunderstanding today. What Shettles Actually Found Shettles observed two distinct morphological types among sperm cells: Y-bearing sperm (the type that produces boys): smaller, faster, and less resilient. They move quickly but die sooner in acidic conditions. X-bearing sperm (the type that produces girls): larger, slower, and hardier. They move more slowly but survive longer in varied environments....

The short answer: yes, sustained heat impairs sperm production, and the damage happens before you'd notice it. Here's what's actually going on, what the research shows about specific heat sources, and what to do about it in the 90 days when it matters most. Why Temperature Matters for Sperm The testes sit outside the body because sperm development (spermatogenesis) requires a temperature approximately 2–4°F (1–2°C) below core body temperature. The cremaster muscle regulates this by raising or lowering the testes in response to ambient temperature. When scrotal temperature is elevated above the optimal range, even temporarily and repeatedly, the thermal...