There's no note of sexuality here, which is also important. Celie was raped repeatedly by Mr., her husband, and her step-father. She grew numb to it, which can happen with repeated abuse especially when it happens so often. The only sex she ever enjoyed was the completely consensual and compassionate time she shared with Shug. That makes Celie possibly gay/lesbian/bisexual/queer, or even asexual because she wasn't actually concerned about the act but more the emotional attachment and connection with Shug. Without any other positive sexual experiences to compare it to, it's difficult to determine but she certainly is not heterosexual. Shug is certainly bisexual/pansexual/queer. There weren't really words to describe queer relationships at the time but now in 2014, we can say it.