This week, the lovers welcome smooth operator Mr. Zack Poitras, AKA Dr. Sex Man over at The Occasional on Funny or Die, into their love lair. In a Ménage à Trois Radio first, the threesome FINALLY DINES! The magical snack gives them the energy to get down to brass tacks—Zack explains why he crawls into a man's van, Diana shares her motivations for waiting outside the local high school, Murf opines on making sweet love to Kevin Costner, and everyone salutes the wonder that is the human vagina. You're gonna want more Zack, so go follow him @bigzackpoitras and read his hilarious musings in The Onion and Funny or Die. Hedo Rick for President!