Known fact #2: They tend to be killed for their horns. Like, a lot.
Soo...
1. If unicorns are only attracted to virgins, they must only ever mate once.
2. In order to maintain a stable population, female unicorns must give birth to at least 2 babies each.
3. However, since unicorns are hunted relentlessly, females must actually give birth to far more offspring in order to ensure survival of the species.
4. Think: What other species are there in which the female gives birth to many young after mating once?
5. Ants and bees -- hive insects!
6. So, unicorns are bees.
7. No, wait, that's not right...
8. Unicorns probably have a 'hive' structure, in which there is one 'queen' who gives birth to many young after only mating once.
9. As most of the wild unicorns seen by humans can be assumed to be male (attracted to girls, have goatlike beards) we can also infer that the females are either rarer, kept secluded, or both (the second because of the first).
10. Possibly the large legions of male unicorns serve as some kind of guard for their queen-mother.
11. Since unicorns are immortal, one queen could easily produce enough young to overpopulate the entire planet, given enough time.
12. And an overpopulation of unicorns could consume all of the plant life in their territory and either wander onto the golf course or starve.
13. Due to their only mating once, it is likely that the population explosion cannot be halted through the capture, sterilization, and release of (mostly male) unicorns.
14. Unicorns have few, if any, natural predators. (The dragon and griffin are endangered species, after all.)
15. Therefore, human culling of the wild unicorn herds is not only desireable but necessary.
16. After all, we wouldn't want them to out-compete deer.
17. (We like to hunt those, too.)
18. And unicorn makes great sausage.
19. (Actually, I made that one up. But I bet it tastes good.)
20. So...support your local Unicorn Hunters Association! Protect our wildlife through caring population management!
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*giggles* I thought it was funny, at least.
It was hilarious, I hope there's more of it when I go to the comic con this year. 
