Two-Way Girls by Val Seran

They were drawn irresistibly into a web of passion no man could understand... or tame! Paula Havaland was a real knockout -- even at her husband's funeral. She was such a knockout that when her next-door neighbor came to comfort her, he stayed all night! Then Paula's former school chum, Josephine, came to live with her. Both girls found that their restless young bodies could not be satisfied by the most virile men in town, and inevitably they turn to each other for the satisfaction they so desperately needed!