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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.