MIT倒是网开一面对研究生，但是对本科生坚决不行。这些学校和我理解得完全一致

https://policies.mit.edu/policies-procedures/90-relations-and-responsibilities-within-mit-community/99-consensual-sexual-or#:~:text=Sexual%20and%20romantic%20relationships%20are,with%20undergraduates%20are%20always%20prohibited.

Sexual and romantic relationships are prohibited where the faculty member or other academic instructional staff member has or might reasonably be expected to have “academic authority” (defined above) over that graduate student or other learner. (Such relationships with undergraduates are always prohibited. See Section 9.9.3.1.)