Disney Gets Buttilicous?

Can someone explain to me what is going on in Disney’s new movie The Princess and the Frog – when the male characters butt grows after embracing one of the female characters in the movie (see photo)?

What does it have to do with the movie plot?

Are there racial undertones to the scene?

Is Disney up to its old tricks?

I hate to say it when I haven’t seen the movie, but what is Disney thinking?