At my time, 10 years ago, they caught a gay couple giving each
other BJs in the concourse during the "A" levels exams
period.
I have also seen a few used condoms once in a while on the terraces
facing the field.
There was also this girl who had a list of guys whom she called
whenever she wanted sex.....very horny.
The ultimate one: after a tutorial class, my CT group guys (about
10 of us) stayed back in the classroom, locked all the doors....one
girl stayed back......leave it to your own imagination.
Hope it's still as "happening" in VJ.