64 On Chakras
This is just symbolism.
They were necessary at one time, but for an initiate they should be understood as what they are.
The body does have energy centres, and this can be called chakras.
What this talk about the "sixth chakra" really refers to is that when you reach a certain state in meditation, you go beyond the internal division you and all human beings have within; the division between the part of you that is male and the part of you that is female.