When a male snake is ready to mate, he'll try to get the female's attention. They like the fresh smell. They will nudge the females' backs with their chins and maybe lick them with their tongues in an effort to let the females know. He might also try riding on her back while she crawls along.
Females are less obvious when they are ready to mate.
When your snakes are having sex, you will see them curl up together and literally tie themselves together in a knot. If you happen to be watching your snakes during this process, you won't know exactly when they're copulating. If you want your snakes to breed, there are some steps you can take to try and improve the odds. Make sure they live at the proper temperatures and humidity levels. Many times snakes don't want to mate with a snake they have spent so much time with.