Semen is the fluid discharged from a male's penis during sexual excitation (orgasm). The squirting of this fluid is called ejaculation. Semen is composed primarily of fluid and sperm cells (spermatozoa), but also contains a relatively high concentration of lymphocytes (T-cells). There appears to be high concentration of HIVs in the semen of HIV-infected men. Semen is an infectious substance; it can transmit HIV infection.
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