Quantum mechanics and probability kick in after geeky sex.
The probability distributions differ depending on the exact nature of the geeky sex:
A is the probability that the parties fall asleep after geeky sex.
B is the probability that the parties get up and do something productive after geeky sex.
C is the probability that an intelligent conversation will occur. Scientists are still debating whether or not this is an actual end-state of the process, since some scientists believe that this behavior can be construed as an inherent aspect of geeky sex.
Also, geeky sex is awesome!