You don't know what evolved on that swamplike planet.Kumomaru said:The same reason humans want to have sex with elves - they're hot hot HOT!!!Gerazzi said:If they had the same number of chromosomes and similar DNA then it's possible and this goes into genetics as well as they'd have to be mammals and I really don't understand why anyone would want to have sex with an alien.
As for the actual thread, highly improbable. They'd need to be close enough in DNA structure to mate with us (like dogs and wolves) which i'm pretty sure means they need to have the same number of chromosomes we do and be mammals. I'm not saying it's impossible, i'm just saying it's unlikely.
Could be 20 foot tall mosquito people, for all you know.