What does Otis mean by Kanye West and Jay Z?

In the song Otis, Jay-Z and Kanye West rap about what they love. When Kanye says "Otis", a reference to hip-hop legend Otis Redding, he is referring to sex. According to Kanye in an interview about his song Otis, sex with a woman of color takes him over the rainbow, referencing another popular Otis Redding song of the same name.