Mazal tov on your upcoming marriage!

The laws of harchakot are designed to be stricter after the couple is married. The reason for this is the assumption that once a couple are allowed to have relations after marriage, the separation required during niddah is greater. Since a couple may not have relations before marriage, a lesser degree of separation is required, and an unmarried couple may pass things to each other as long as they take care not to touch each other in the process. Obviously any situation that would lead to physical contact, or to attraction and intimacy that could lead to transgression, should be avoided. An engaged couple must also be extra careful to avoid situations of yichud (being alone together in a private place).

We wish you much hatzlachah and please reach out if you have any further questions.