It may look like they're snuggling up, but really they're just competing for the same spot. I'm not sure when corn snakes can breed, but your little girl really should not be bred before 2 or 3 years old. And yes, as soon as your male wants to, he will attempt to breed with her.
Also, cohabitation is generally frowned upon because of how easy disease can be spread and the threat of cannibalism. If one snake gets sick, then the other will get sick as well. Also, if one snake regurges, you won't know who did it! Snakes can and will eat each other--just tell me if you want to see the pictures of regurged snakes. So, while I cannot stop you from cohabbing, it is putting the lives of your snakes in danger. Just wanted to tell you in case you didn't know already!
Although rattlesnakes are actually social!! They care for their young and each others young, and have family reunions!! I think that's so cool!