普林斯顿大学好像稍微宽松些，和凌志兄说得差不多

https://dof.princeton.edu/governance/policies/consensual-relations-students#:~:text=Faculty%20members%20shall%20not%20initiate%20or%20engage%20in%20any%20romantic,an%20actual%20conflict%20of%20interest.

Faculty members shall not initiate or engage in any romantic or sexual behavior or relationship with any other member of the University community, regardless of the other person’s status, if the conduct would create an actual conflict of interest.  In instances involving an actual, apparent, or potential conflict of interest, the parties must promptly disclose their romantic or sexual relationship to their respective department chairs and to the Dean of the Faculty.