hey! HK kids, what the xxxx is going on?

A student, 20, came to me right after class and started quite an OPEN discussion with me in front of the classmates:

學生 (高聲地): Sir, 有無興趣一齊返大陸玩玩?
Sir (冷淡地): 玩乜?
學生 (猶疑地): hmm ... 我同 firm (學生係 CPA firm part-timer) 既同事去大陸玩 ...
Sir (不耐煩地): 咁即係玩乜?
學生: 嘻嘻 ... 都係玩男人玩既野啦 ...
Sir (汗顏): 我唔興玩呢 d 野 ...

I dunno what u think ... I shared it with one of my colleagues (male) and both of us were amazed by the fact that the student discussed it with me so OPENLY, that he was shameless in discussing such a topic so OPENLY with his TEACHER. I have some thoughts:

1. I personally think if one loves to mess around that's his/her own matter to mind. If he/she tries to pass this on to me, no damned way!
2. Should I refine the way I present myself in class? Maybe I'm behaving like I love messing around? hmmm ...
3. What the heck is in the mind of today's kids?
4. Did he really MEAN it?