The Sins of Martha Leslie by Don Holliday

Front cover states: No other woman could have done such things - The shocking tale of a legalized tramp

From the back cover:

Martha Leslie wanted only one thing in the world more than love. Money. She got it by tricking Herbert Brock, Dover Ridge's richest man, into marriage. Yes, she got the money. But she couldn't get the love.

Herbert Brock was a fig. Martha turned to the other men in town for her pleasures, Practically every man, in fact. But even they could not fill her hunger for love which was like a bottomless void. So she turned to women.

This is more than a story of adultry. It is the story of all the passions and lusts that seethe beneath the surface of a small town and how one woman caused them to erupt.