Question

I guess my viewpoint is rather parochial, but when I saw the question, I wondered where OP got such ideas of politeness. Reading the previous answers, though, I realized that different practices may be current, depending on the national culture, or even the culture of the university in question. Speaking strictly for myself, I would have considered it quite improper to have my name on a student's thesis, in effect robbing the student of the credit that was deserved.