Females only spray when they are frightened. Out of my 5 females, I only had one that sprayed me a couple of times (its not fun, especially in the face, but hey, all you can do is laugh). With the advice of everyone here, I was able to break her of that easily. I have only personally found one mating plug, and never any estrus plugs. It isn't something like poo that they leave all over the place. Unless you are planning on breeding, which is something you shouldn't just jump right into, hair rings in males won't be a big problem. They clean themselves regularly (both the males and females). I haven't had one yet (knock on wood!!!!). I would just take my time in choosing. Play with a couple of them and see whose personality jumps out at you. Unless you are getting a pair, the sex is dependant solely on what you would prefer. There are playful males and grumpy males, and the same with females. Keep us posted on your new chin!!!!