<p>::Most colleges WOULD discipine a professor who is having relations with a student, because it is per se harassment. They tend to (or at least my alma mater did) have policies which strictly forbid professors to date students, and, in some situations, even TAs to date students.::</p>
<p>It depends on the school, but most of the time that is not the case. Provided the students aren’t saying that there is sexual harassment involved, there is nothing illegal, against the school rules, or even unethical in a professor dating a student as they are both adults. Now the only problem arising from this which universities do not like is the possible conflict of interest. Some colleges (like UC) have banned professor-student dating, but most schools don’t care, especially if the student is not a student of that specific professor.</p>