spring rushee

Hi friends! I have a question. So I saw this Sperry man in my GEO 135 class wearing Sigma Phi Epsilon letters last semester. But now in my Econ 105 class the same guy was wearing Pi Kappa something letters. What is going on? Can you be in two fraternities at once? Could I be a Sig ep and a Pi Kapp at once? Or a Sig Chi and a Pi Kapp? Or a D-Chi and a Pike? Or a Sig ep and a Delta Sig? Or an SAE and D Sig? But my friend told me you can only be in one fraternity your whole life. Someone please give me answers. I would love to join two houses. I can rush one now, and another next fall. More brothers = more brotherhood. Plus if I'm in more than one, I have two options on which parties to go to every night. Please let me know! Rush is coming up soon!