They don't – the donors do it themselves. They're given a specimen jar and are shown to a private room, where they practice something called masturbation – you've heard of that, right? That part of the sperm-bank industry is pretty low-tech. When a donor is finished, his semen is usually cryogenically frozen and stored at very low temperatures, where it can remain for years until it's needed. By the way, freezing your semen in a household freezer kills the sperm cells. They're cooled too slowly, so ice crystals have a chance to develop, destroying cell membranes and other structures. At a sperm bank, the semen is flash-frozen by plunging it into liquid nitrogen. It cools so fast that ice crystals don't have a chance to form, to the sperm cells are good as new when they're finally thawed.
What do you think about when you masturbate or have sex? Would you tell your significant other if they asked?
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How do sperm banks induce male orgasm?
