Most of the times, thin or watery semen is due to the absence of sperms or low sperm count. This is one of the reasons that can cause infertility in men apart from premature ejaculation, delayed ejaculation, sperm morphology problems, sperm motility problems etc. When there is less production of sperms, the ejaculate contains more of watery liquid and therefore it looks thin and watery. Frequent sex and masturbation are major reasons for watery semen in perfectly healthy individuals but there are other causes that contribute to watery semen.
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