Related for Kiddushin 164:1

Any man who is occupied with women/wives shouldn't be secluded with women/wives, e.g. those who sell nets, who sell flax or hatchelled wool, weavers, perfume sellers, tailors, barbers, launderers, whetters [of millstones]. (Translated from Ehrfurt manuscript:) Rabbi Meir says: There is no trade that passes from the world but woe to a man who sees his parents in an unfit trade. Rabbi says: A man should strive to teach his son a clean and easy trade, and pray to the One to Whom wealth belongs, for there is no trade that doesn't have in it poverty and wealth; this is to tell you that wealth and poverty doesn't come from trade [but from God].