Latest business school studies suggest:

Men appliy ethical standard relative to their role (or personal benefit) in transaction.

Wharton School asked if you had to decide on ingredients based on profit versus potential harm, women would not harm.  Men wanted profit.

Women targeted for deception by both men and women.

Women take themselves out of the game because they feel morally compromised.  Women may find a way to stay in the game and be ethical if they understand this dynamic.