Alec,

I suspect that the term "cushie" is a relatively recent term (i.e. 20th Century perhaps), and I also suspect that it comes from the word "cushion" so it has more of the meaning of soft & comfortable, so a "cushie life" or a "cushie job" is soft, comfortable, and easy. I'd be very surprised if the other use of "easy", with reference to a woman, is related to that meaning.

I'll look up some definition & dictionary sites, and also some dictionaries to see if I'm wrong (or right.

Helen