Title: Foreign Lovers - Philip José Farmer - book
Summary :
Married to a frigid and bigoted woman, Hal Yarrow is suffocating in the form of civilization imposed by the Clergetate. This is why he enthusiastically accepts Sandalphon Macneff's proposal to leave Earth aboard the spaceship Gabriel, bound for the planet Ozagen. It is there that Hal meets Jeanette, a young girl whose origins remain obscure. With fear at first, then with passion, Hal discovers carnal love, he who had never seen the naked body of his own wife. He does not hesitate to defy the hierarchy and the holy abbots who lead the Earth expedition. To protect his love, he goes as far as murder. But is he really sure that this creature, who came out of nowhere, is really human?