Busy building your own stunning rocket sled? Never fear we've recapped the week right here, including Sping Mating Season goodies, treeple attacks and Joss Whedon's Harvard lecture recap.

It's Spring Mating Season - In Space! [NSFW]
Spring is here, and the aliens are out cruising for robot babes and human cuties. All week on io9, we've been celebrating this frisky season. Let's get started with a shocking gallery of sexy scifi.Can you handle the truth about love and sex among all the creatures of the universe?

Man Grows 5 Centimeter Tree Branch In His Lung
Remember when grandpa told you not to swallow those watermelon seeds? Well, he wasn't screwing around. Some poor sap from Russia just had a fir tree removed from his lung.

Joss Whedon Accepts Award, Drops Dollhouse Hints, Names Winner Of Buffy
Joss Whedon stopped by Harvard last night to receive the 2009 Lifetime Achievement Award in Cultural Humanism, and we were there to hear him wax philosophical, talk Dollhouse, and settle the Whedonverse's most important debate.

Terminator Concept Art Shows The Wreckage Our Rebellious Robots Leave Behind
New Terminator Salvation art shows us the dismal future we all face - including a special look at San Francisco's bleak wreckage. Enjoy the end of the world.

Science Fiction Sex Toys We'd Like In The Real World
Since science fiction was invented, the real world has followed in its footsteps, whether it's language or replicating fictional moral dilemmas. But there's one area where the real world is sadly lacking: science-fictional sextoys. More »

Talking Tron 2 With Tron Guy
Now that Tron 2 is filming in Vancouver, all sorts of fun pictures and rumors are leaking out. We went straight to the expert to analyze what we've seen and wax on about disc fighting.

Seven (Mostly) Scientific Devices for Measuring Sexual Arousal
Scientists can measure atoms and they can measure the distance from our sun to the edges of the universe. So of course they also have instruments that can determine precisely how sexually aroused you are.

Secrets Of Hustler's Star Trek XXX Movie
What exactly is Khan Noonien Singh doing in Hustler's new Star Trek porn movie? And what role does Sasha Grey play? We talked to screenwriter Roger Krypton. Plus an exclusive work-safe clip and pics.

Send an email to Meredith, the author of this post, at meredith@io9.com.