Why Do You Not Like Having Your Portrait Taken?

Serious question, there are two groups that I struggle with to get to agree with getting their portrait taken, one is women and the other is ethnic minorities. I have no idea why, I approach and ask the same questions I do for everyone else but whereas my refusal rate for others is about 10% for women and people of other ethnic backgrounds its more like 90%, Why?

This was one of the few that said yes, it was a mutual exchange of information, she needed mine for the charity she was working for so the exchange was my information for her portrait. Even then it took a little cajoling to get it and I don't know why as she is a very pretty girl. The hardest part of this image for me was black and white or colour, I went for colour ;)
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