HOney, I was browsing the "Boundaries in Marriage" Amazon page and came across this: Sex, Romance And The Glory Of God: What Every Christian Husband Needs To Know. Well, anyway, the TITLE might appeal to him (although I know, as a former Catholic, that books with "Christian" in the title don't necessarily appeal to Catholics.)
BTW did Kosher Sex ever come from the Library? It's about passionate sex in a very, very religious context.