I have permanent browner bits than the permanent white bits. The sun does what it does to the bits I don't cover up but I don't waste my time in seeking out tanning perfection.
I'm very tanned apart from my white ass.....did go fully nude Thursday just gone then the weather changed Friday so still white ass remains ....but I was told on the Saturday that I am the same colour as my bench in the garden which has just been ronsealed lol