12 November 2013, 07:02 PM ET
A simultaneous hermaphrodite, the slug has both male and female reproductive organs that it uses simultaneously during sex. The male organ is a two-pronged penis equipped with spines.
12 November 2013, 07:01 PM ET
Lots of animals take part in what humans might consider bizarre mating tactics, but one sea slug might take the cake: it stabs its partner in the head.
01 November 2013, 09:11 AM ET
Though they may look different, penguin mating behaviors are surprisingly similar to other birds. Even so, each of the 18 penguin species has its own little mating quirks, with some doing a look-see of the male's bachelor pad before shacking up.
15 October 2013, 11:42 AM ET
Sea lampreys use a digestive enzyme called a bile salt as a sexual pheromone, excreting it through their gills after not eating for weeks.
07 October 2013, 03:00 PM ET
Live fast, die young. Males of some insect-eating marsupials survive less than a year before mating until they die. They follow this strategy to increase the number of offspring they can sire, a study shows.
02 October 2013, 05:00 PM ET
For insects like aphids, a raindrop on their head is like a refrigerator falling on a human, so it behooves them to detect stormy weather and avoid such naughty acts.
02 October 2013, 08:47 AM ET
Unlike many other animals, kangaroos have sex for a long time — up to 50 minutes. And the female has three vaginas, two of which are inseminated by the male's double-headed penis.
27 August 2013, 09:40 AM ET
Seahorses have a sex role reversal, where males get pregnant instead of females. But how do they actually get busy and get pregnant in the first place?
23 August 2013, 01:11 PM ET
Females of two bug species may have figured out a way to lessen their chances of being on the receiving end of their species habit of "traumatic insemination."
15 August 2013, 04:52 PM ET
Homosexuality has been found in a wide range of animals, but it is not well understood in the insect world. A recent review of insect homosexuality shows that, for the most part, it occurs as a mistake.
25 July 2013, 09:27 PM ET
Sure, birds can fly, but how do they have sex? Can they do it in the air? And where do they keep their reproductive organs? For humans to understand bird sex, they must first put all thoughts of mammalian sex organs out of their heads.
24 July 2013, 11:04 AM ET
The Newport Aquarium in Kentucky announced the death of its latest acquisition, a shark ray. The exotic-looking fish — also known as a bowmouth guitarfish — was killed during the act of mating by an amorous male.
24 July 2013, 08:13 AM ET
Scientists have never documented blue whales mating, but they know there is a dating period where a male follows a female for weeks on end. And sex is not a forgone conclusion for the couple, it seems.
01 July 2013, 11:39 AM ET
This ugly parasitic fish generates heat when potential mates swim by.
26 June 2013, 07:05 PM ET
Females use one shot of sperm to fertilize their eggs for the rest of their lives.
17 June 2013, 05:20 PM ET
Tough love: After mating, male fishing spiders spontaneously die.
04 June 2013, 07:01 PM ET
Rather than fertilizing her eggs, the female squid scoops sperm up for a healthy snack.
30 May 2013, 07:42 AM ET
Most crabs prefer the missionary position while essentially "naked."
18 May 2013, 09:03 AM ET
It involves a peculiar male dance and multiple partners.
29 April 2013, 07:22 AM ET
Some male newts, sans any penises, use powerful pheromones to drive females wild.
17 April 2013, 08:02 AM ET
Are these fearsome predators gentle lovers?
08 April 2013, 02:34 PM ET
With all the interest in duck sex these days, a lecture by the discoverer of gay mallard necrophilia seems timely.
05 April 2013, 08:34 AM ET
Let's just say the risky business involves pedipalps covered in sperm juice.
01 April 2013, 11:48 AM ET
Bats show a surprising range of sexual behavior.
25 March 2013, 04:16 PM ET
Not tonight, honey, I have a spike in my crotch.
25 March 2013, 10:08 AM ET
The sensual mating dance involves rubdowns and bubble-blowing.
15 March 2013, 09:20 AM ET
They may share most of our DNA, but their sex style is much bolder than most human sex.
06 March 2013, 10:18 AM ET
Scientists are unveiling a rare Pacific octopus with a taste for eating its partners during sex
04 March 2013, 08:46 AM ET
The fuzzy insects go all out for sex with acrobatics and death for the male.
20 February 2013, 01:46 PM ET
Unlike many other reptiles, alligators use a penis that is always erect and pops out of their bodies to mate.
19 February 2013, 07:01 PM ET
Birds and other monogamous animals may continue to make showy mating displays after pairing up because it increases their children's survival.
14 February 2013, 11:09 AM ET
Strange mating behavior may keep snails from fooling around with other beaus.
14 February 2013, 08:21 AM ET
From dinosaur sex and monkey harems to fossil turtles getting it on, here's a look at lust in the animal world.
12 February 2013, 07:01 PM ET
Male guppies prefer ladies surrounded by drab male suitors, upping their chances for action.
12 February 2013, 07:01 PM ET
Nudibranch, a species of mollusk that maintains two sexes at once, use an easily regenerated, disposable penis to have frequent sex
12 February 2013, 11:00 AM ET
Nobody wants to get caught cheating, baboons included.