Animal Sex: News and Features

From an evolutionary and biological perspective, animals are driven to have sex in order to procreate. But there is a lot more to sexual relations between animals. Animal sex is at least as strange and varied as human sex. A male might copulate with many females. And female animals of many species can be choosy, too. Homosexuality is common. Monogamy is rare. And the animal kingdom is full of swingers. In short, with animals, sex can be wild.
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Latest Articles

Animal Sex: How Giraffes Do It
two giraffes touching lips
November 14th, 2015
Giraffe sex involves cocktail parties, statuelike stances, urination and instantaneous ejaculation.
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Why Some Species Have More Females Than Males
green lizard
October 7th, 2015
Scientists have figured out why some species have more females than males and others have more males than females. Turns out, sex chromosomes are the culprits.
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#JunkOff: Why Animal Genitals Are Important to Science
weird animal penises, animal facts
September 2nd, 2015
A Twitter hashtag, #JunkOff, illustrates the steamier side of biology — and its importance to understanding evolution.
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Howler Monkeys with Deeper Calls Have Smaller Balls
hooting male howler monkeys
October 22nd, 2015
It's a tough trade-off for male howler monkeys: a deeper voice, or more sperm?
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Animal Sex: How Sea Hares Do It
A spotted sea hare (Aplysia dactylomela) in Bermuda.
October 4th, 2015
Sea hare sex involves hermaphrodites, mating chains and lengthy mating events.
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Animal Sex: How Hyenas Do It
A spotted hyena mother with her cub.
August 31st, 2015
The complicated world of hyena sex involves social hierarchies, weird and potentially dangerous courtship rituals and female pseudopenises that make forced sex impossible.
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Photos of the Northern Giant Mouse Lemur
Lemur in tree
July 15th, 2015
Check out these images of the northern giant mouse lemur, Mirza zaza, which has the largest testis relative to body size of any primate.
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If Aliens Exist, Would They Have Sex?
illustration of aliens
October 14th, 2015
Aliens might have sex, assuming the benefits outweigh the risks on their home planets. What that sex would look like is an open question. But if animal antics on Earth say anything, extraterrestrial sex would be weird.
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No Boys Allowed: Snake Mom Has 'Virgin Birth'
The yellow-bellied water snake.
September 24th, 2015
A female water snake in Missouri can do something that no human woman can (no matter how badly she might want to).
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Animal Sex: How Butterflies Do It
Two Butterflies
August 2nd, 2015
When it comes to sex, are butterflies as nurturing and gentle as they appear to be, or is there a more aggressive side to their mating?
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