Although Seneca is known primarily as a Stoic philosopher, he draws on Neopythagoreanism for his views on sexual austerity. Neopythagoreans characterized sexuality outside marriage as disordered and undesirable; celibacy was not an ideal, but chastity within marriage was. To Seneca, sexual desire for pleasure "(libido)" is a "destructive force "(exitium)" insidiously fixed in the innards"; unregulated, it becomes "cupiditas", lust. The only justification for sex is reproduction within marriage. Although other Stoics see potential in beauty to be an ethical stimulus, a way to attract and develop affection and friendship within sexual relations, Seneca distrusts the love of physical beauty as destroying reason to the point of insanity. A man should have no sexual partner other than his wife, and the wise man ("sapiens", Greek "sophos") will make love to his wife by exercising good judgment "(iudicium)", not emotion "(affectus)". This is a far stricter view than that of other Stoics who advocate sex as a means of promoting mutual affection within marriage.