A second University of Sydney college has come under fire for "ritualistic humiliation" after students revealed sexual activities would regularly be broadcast over the college's PA system.

A former student of St Andrew's College, Kendra Murphy, has told Fairfax Media that college leaders would broadcast weekly news of sexual encounters between students during the college "lolly buffet".

"At 9pm the college seniors would announce things like 'Mary' and 'Joe' were seen hooking up, or they saw people going to Sancta [Sophia College], heard a three-way was on there," she said.

One week after the college's "victory dinner", Ms Murphy was herself the subject of the broadcast to the college campus after an incident with a fellow St Andrew's student.