If you get a male, please properly quarantine him for a LONG time before bringing him near your females. With boas, some will recommend even a year quarantine!
I haven't had issues with introducing male snakes to females. If you're worried, keep an eye on them when you introduce them, but I think it would be fine.
I've only breed ball pythons, but it seems that once they become gravid, they're not too interested in food.