5 LITTLE-KNOWN FERTILITY FACTS Which fact surprised you most? 👇 1️⃣ Sperm takes about 3 months to develop. Lifestyle changes today may take months to show up in sperm quality. 2️⃣ One testicle can be enough. A single healthy testicle can produce enough sperm for natural conception. 3️⃣ Fertility isn't the same as sexual performance. A man can have normal erections and still have low sperm counts. 4️⃣ Fertility can decline before periods become irregular. Regular periods don't guarantee normal egg quality or open fallopian tubes. 5️⃣ Lubricants can matter. Some common lubricants can impair sperm movement in laboratory studies; fertility-friendly options may be preferable when trying to conceive.