Help me "get" this really bad joke...

<p>no, it’s just sex = fun :stuck_out_tongue: I did say it was kinda lame. Bonus points to you. Arup (the teacher) told me that joke when I showed him my Caltech box (part of the app as you all know)… my box was on “The equation for happiness”. He says that’s his equation for happiness :P</p>