Scientifically accurate.
It's true, the virus is sexually transmittable.
Anyway, I love what you did with the text. The write was exceptional as well. It was extra funny for me because I've had to think about fucking zombies many times in the past. I came to the same conclusion that you did. Just use a condom. 99.7% effective when used properly.
Animation was nice. Their facial expressions were excellent, and were accompanied with professional grade voice acting. Your choice of colors set a good atmosphere. Nice game voice as well.
As far as improvements are concerned, the characters' movements were kind of unnatural. They were jerky at times, and their bodies are drawn a bit out of proportion, especially how Dyn's head is so squished. The overall art could use some refining, but meh. Not bad enough to warrant a complaint.
All in all, this flash get's a grade of Fuckin' Amazing.
Oh, and why did you choose to spell it "zomby". You know that just makes it harder to search for, right?