Daf Yomi - Chagigah 11 - OVERWHELMING DESIRE

The Gemora had stated: A person has a powerful desire for an illicit relationship whether the object of his desire is in front of him or not. It is because of this that it is forbidden to teach three students the secret details regarding the laws of illicit relationships; we are concerned that when one student is conversing back and forth with his teacher, the other two students will talk among themselves and will not learn the halacha that their teacher is saying; subsequently they might eventually permit an illicit relationship.

The Rambam in Hilchos Issurei Biyah (22:20) writes: Therefore, it is incumbent on each and every person to acclimatize himself to increased levels of sanctity and pure thoughts at all times in order to refrain from sinning in these matters, where there is an overwhelming physical urge to sin.

Reb Moshe Feinstein (Y”D III: 80) cited this Gemora and Rambam as proof to his ruling regarding a Beis Yaakov in Baltimore, that they cannot build their new school adjacent to a Yeshiva for boys. He states that we must be vigilant in these areas for otherwise, it can result in the spiritual destruction of this world.