• Photo courtesy of Craig Stillwell
• Sexual size dimorphism: Female hawk moths (left) are larger than their male counterparts

So you like big butts and you cannot lie? UA researchers have a new theory about sexual dimorphism.

Daniel Stolte from the UA has some details:

Take a look around in the animal world and you will find that, in most organisms, individuals of one sex are larger than the other of the species.

Even though evolutionary biologists have long recognized this discrepancy, called sexual dimorphism, they have struggled for decades to solve a major paradox: How can males and females of one species be of different sizes, given that they share the same genetic blueprints dictating their development and growth?

Researchers from the University of Arizona have discovered that the key to unraveling this mystery lies in

The folks over at BikeSmut really like bicycles. And sex.

How much, you ask? Find out for yourself tomorrow night, when they ride through the Old Pueblo to show their latest flick, Bike Porn 3. Event details here.

Starting on Valentine's Day, the Center for Biological Diversity will launch an educational Web site (www.endangeredspeciescondoms.com) and will distribute 100,000 free Endangered Species Condoms throughout the country.

The condoms feature six threatened or endangered species, orginal artwork and slogans such as, "Wrap with care, save the polar bear." They report the human population is expected to be at least 9 billion by 2050. Over population is a direct threat to wildlife.

Read the official press release below. (Full disclosure: Weeklycolumnist Randy Serraglio has been one of the key people behind the effort):

Group Gives Out 100,000 Endangered Species Condoms for Valentine's Day Educational Project Highlights Impact of Human Overpopulation on Wildlife Five People to Win Lifetime Condom Supply

TUCSON, Ariz.— With 3,000 volunteers operating in all 50 states, the Center for Biological Diversity will distribute 100,000 free Endangered Species Condoms beginning on Valentine’s Day and has launched an educational Web site — www.EndangeredSpeciesCondoms.com — chronicling the devastating impact of human overpopulation on endangered species. Additional free condoms will be distributed through the site, and five people will win a lifetime condom supply.

Six different packages with original artwork and edgy slogans feature the polar bear (“Wrap with care, save the polar bear”), jaguar (“Wear a jimmy hat, save the big cat”), American burying beetle (“Cover your tweedle, save the burying beetle”), snail darter (“Hump smarter, save the snail darter”), coquí guajón rock frog (“Use a stopper, save the hopper”), and spotted owl (“Wear a condom now, save the spotted owl”). All six species are listed as threatened or endangered by the U.S. Fish and Wildlife Service.

“Human overpopulation is destroying wildlife

Some people call it advertising and others call it soft-core porn, either way American Apparel hasn't made best friends with feminists who've always questioned AA's owner Dov Charney's nasty, slimy approach to marketing his political feel-good T-shirts and such. Besides the ad images, Charney has been accused of sexual harassment by former employees. No shocker there.

Just to continue to prove how slimy he is, however, Charney's on a hunt for new models by asking women to put photos of their backends online to be scored and commented on - the Best Bottom in the World competition. Visit here, and remember: NOT FOR WORK. Actually, I think its fine to put up pictures of a bunch of different butts. But to be fair, the man needs to put up some men's butts, too.

Of course, there's a petition against it. If anything they should be fighting that in the end the winner only makes $300, which kind of smacks like sweatshop change.

It's bad enough that the Internet is killing off newspapers and the music industry. But now The New York Times brings us the news that it's also wiping out porn films with a veneer of plot:

The actress known as Savanna Samson once relished preparing for a role. “I couldn’t wait to get my next script,” she said.

There’s no reason to look at them anymore, she said, because her movies now call almost exclusively for action. Specifically, sex.

The pornographic movie industry has long had only a casual interest in plot and dialogue. But moviemakers are focusing even less on narrative arcs these days. Instead, they are filming more short scenes that can be easily uploaded to Web sites and sold in several-minute chunks.

“On the Internet, the average attention span is three to five minutes,” said Steven Hirsch, co-chairman of Vivid Entertainment. “We have to cater to that.”

In “Riveting Reads” this week, Loft Cinema program director Jeff Yanc recommends a few books, including Bonk by Mary Roach. Yanc says: "This is a highly entertaining (and even educational) survey of sex research around the world. Some of my favorite topics explored include Danish pig insemination, pornography for pandas, arousometers, vaginal upsuck and womb fury. A very fun, breezy read that's perfect for reading aloud to children sitting next to you on a long plane ride."

Here’s Roach sharing “10 things you didn’t know about orgasm” with a crowd at TED. The clip of the Danish fellow stimulating a sow is like hog porn.

If marriage is so sacred, how come Jesus didn't do it?