Both males and females can regurgitate! I currently have a female conure that tries to regurgitate for me! Ewww... lol She's supposedly laid eggs already, which confirms that she's a hen!
Is it normal? Yes, for a birds mate. However, you can't physically be a birds mate, so the behavior shouldn't be encourage. It's better to try to prevent the behavior and redirect them. Simply ignoring a behavior may not be enough to really discourage it, and a lot of behavioral problems originate from birds being too hormonal.