Martin Luther portrayed by Lucas Cranach
Luther had a great deal to say about sexual desire. Just remember the caveat of Karant-Nunn and Wiesner-Hanks (2003), considering drinking beer and the bluster among men, "Some of Luther's most colorful statements about women or sex appear in the table talk, but these may not reflect his most considered opinions."
Luther repeatedly asserted that sexual desire is God-given. “God drives man to marriage by means of sensual desire. Otherwise, if it were not for love, who would get married?” he says (in No. 566). “The longing of a man for a woman is God's creation.” (in No. 1659) “Rather, the act which attracts sex to sex is a divine ordinance.” (in No. 4153)
Socrates (Naples National Museum) courtesy Ian Scott
A second tenet is that men dread marriage. "These are the annoyances of marriage, and on their account everybody avoids marriage. We all fear the caprice of wives, the crying of children, bad neighbors. So we want to be free, not bound...” (in No. 2867b) “…Socrates is reported to have given a good answer to a man who was contemplating marriage: Whatever you may do, you'll regret it.” (in No. 3508)
A third principle is that God blesses marriage for the godly. "It's the greatest blessing of God when love continues to flower in marriage. The first love is ardent, an intoxicated love which dazzles us and leads us on. When the intoxication has been slept off, the connubial love of the godly is genuine, while the ungodly have regrets." (in No. 3530)
St. Augustine (St Mary's in Oxford) courtesy Lawrence OP
Was celibacy good? Luther said, "When he was quite old, Augustine still complained about nocturnal pollutions. When he was goaded by desire Jerome beat his breast with stones but was unable to drive the girls out of his heart. Francis made snowballs and Benedict lay down on thorns. Bernard macerated his harassed body…” (in No. 3777)
Was sex in marriage good? Once Luther answered mildly, "When one looks back upon it, marriage isn't so bad as when one looks forward to it.” (in No. 1659) In a discussion on voluntary castration to try to eliminate desire Luther objected, “For my part I'd rather have two pair added than one pair cut off.” (in No. 2865b)
All Luther quotations from Theodore G. Tappert, ed./trans., Table Talk V 54 of ‘Luther’s Works’ (Fortress Press: Philadelphia, 1967).
Q. Does it follow that if sexual desire is satisfied outside marriage then marriage itself is less desirable?