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A man makes a face during an orgasm with multiple colors spraying from behind his head.

1,000 Words About a Fraction of a Second: Male Orgasm and Ejaculation

They are two different, often simultaneous, processes that take a split-second to occur.

By Austin Harvey

A mushroom is lit with a pinkish light against a dark blue background.

Why Are Penis Heads Shaped Like Mushrooms?

The penis tip's shape could be due to evolution or chance, but at least there no more spines.

By Jake Hall

Honey is falling down from a dipper into a small dish against a blue background.

Is It Healthy for My Sperm/Semen Consistency to Change?

Sperm consistency that's thick like mucus or thinner than usual is rarely cause for concern.

By Bonnie Azoulay Elmann

A black sperm swimming towards a human egg repeats across a white background.

The Ins and Outs of Sperm Donation

I gave samples but was rejected. Why? And why isn't there more regulation of sperm banks?

By Eric Carlson

A sperm is shown in a bubble above a microscope against a pastel background.

Who Can Benefit From Semen Analysis and What Can They Learn?

At-home test kits give basic information, but lab tests are better when fertility matters.

By Rachel Crowe