Sperm are male reproductive (sex) cells. The word "sperm" can refer to spermatozoon (singular) or spermatozoa (plural). Sperm are tiny cells with an oval-shaped body and a long tail. They measure just ...
Pre-ejaculate, or pre-cum, is a fluid the penis produces during sex to help with lubrication. It can contain some sperm, but has much less than semen, meaning its less likely to cause pregnancy. To ...
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