The Proud Flesh by Kurt von Hausen

From the back of the book: Dianna shut her eyes as she leaned back in the front seat of the used gray Ford Ken's father had given them as a wedding present. Getting married was a wild, impulsive thing - but it had gotten her out of that awful jail. And now what? The marriage had a poor start. She went for girls, and her husband liked other boys. And there was that fanatic after them, the man who dedicated himself to destroying anyone who strayed from the path of normal love.