Hi smale492!
I'm not a professional breeder, just someone who loves cornsnakes! I happen to have a female (Lilly) and two males (Bozo & Chili-Pepper) who were all cohabitated for most of their 8 years. I separated all of them this past April after a short dialogue and interchange between some well-informed members who didn't call me all types of corn-killers and whose sensitivity caused me to research the issue and resulted in me doing the right thing. If you have the time and are interested in that issue, the link is:
http://www.cornsnakes.com/forums/showthread.php?t=143267
I was informed by the person who sold me my snakes what their sexes were (he was correct) and was also told that cohabitation of cornsnakes was OK "because they are community snakes" (he was incorrect). So when Lilly began to lay eggs a few years ago, I wasn't totally surprised. But after I actually caught her & one of the males locked up together while mating, I decided to research how to breed my snakes as part of their general care.
I registered on this site and also read the horror stories of egg-bound females. Lilly happened to fit the minimum criteria for an egg-laying female (the three 3's rule-of-thumb) in that she was over 3 years-old, over 300 grams, and just over 3 feet long. While I prepared a laybox for her, I also had a back-up plan should something go wrong (I have a vet who is GREAT with snakes who happens to be the same vet I take my cats to!). I doubt I would have proceeded without this vital back-up!
Last year, she laid 12 eggs, 3 of which hatched and only 1 of which survived past 3 months (an 11 month-old named Ozzy who's got a GREAT temperament and eats mice so fast he doesn't even taste them!).
This year, I was more prepared since I got actively involved with this forum and Lilly has double-clutched since May 21st (out of 19 eggs, 16 look good, 1 is "iffy", and 2 were slugs and her 2nd clutch laid this past Saturday - 7/2 - has 9 bigger, healthier looking eggs). None have hatched yet, but Lilly is fine! Matter-of-fact, Lilly has been a champ in that she wasn't brumated during winter and was living with the 2 males who mated regularly with her this past spring. She bounced back after every incident of being gravid without becoming egg-bound, thankfully.
While worst-case scenarios should always be taken into consideration, only those who can't or are unwilling to facilitate a thorough and caring back-up plan should abandon any hopes of breeding their snakes, in my opinion. I guess that means that only people who REALLY care about their snakes AND can & will do something about it should something negative occur should own corns or ANY snakes at all, for that matter!
If you worry too much about the potentially negative outcomes, then you will never even attempt something which might be fulfilling. Consider this also: hatchlings that don't eat are a real and constant threat amongst ALL clutches and it takes a lot of hard work, often with heartbreaking results, to care for a clutch of newly hatched corns.
Bottom line: if I'm not willing to take my egg-bound snake to the vet and nurse her back to health, go the extra mile for a stubborn hatchling who refuses to eat, including cutting up pinkies, washing them with Dawn, doing a slew of other things to get them to eat, and eventually even assist- & force-feed them, up until the day they die and/or even have to euthanize them if necessary, then I'm not ready to breed my snakes and may never be. My opinion only, of course.
Just sayin'. :spinner: