
After all, if Raj and Anu ( Rati Gupta) hadn’t canceled their wedding, it would be happening in India next week– and the Wolowitzes have their non-refundable, $3000 plane tickets to remind them of this. While the Hofstadters are working out their family planning, Howard ( Simon Helberg) and Raj ( Kunal Nayyar) decide not to let the bachelor party Howard planned go to waste. When Zack asks him, though, Amy absolutely forbids it.

Leonard calls Zack to give him the bad news, and he recommends that they try Sheldon instead, as he obviously wants the job. She hugs him, and she tells him she knows. Leonard adds to the emotional charge of the moment by telling Penny he has decided he won’t go through with the donation because he’d be heartbroken to know that he had a child in the world that he wasn’t the dad of. He’s also assured her that he will support her no matter how she chooses to go forward regarding children. Leonard goes home to find Penny and Wyatt in the kitchen, where Wyatt has just explained that he doesn’t want Penny to miss out on parenting because having her has been the best part of his life. They also point out that leaving behind his genetic signature in someone else’d child won’t make him a dad. When Sheldon finds Leonard asleep on his sofa in the morning, he and Amy wake him up and suggest that although Penny’s words may be saying that she’s on board with the sperm donation, her actions don’t. He uses the spare key to Amy ( Mayim Bialik) and Sheldon’s ( Jim Parsons) apartment to escape her advances, which include the wearing of sexy lingerie and reading aloud of Batman comics. Perhaps because her daddy doesn’t step up to stop Leonard, Penny attempts to seduce him during the days of his mandatory pre-donation sex fast. He engages in a thoughtful conversation with them, respectful of his son-in-law’s decision and of Zack’s choice of this particular “prize stud.”

Unfortunately, Wyatt’s first words when we walks in the door are about Penny’s non-pregnancy, so she throws Leonard under the bus by revealing his plans with her ex-boyfriend. Wyatt may have a gruff exterior, but he’s a marshmallow inside. Before he walks in the door, Penny gives Leonard a short list of things to avoid discussing: why she isn’t pregnant, that he’s donating sperm to Zack and Marissa and the Cornhuskers. The weekend before Leonard’s date with a plastic cup coincides with a visit from Penny’s ( Kaley Cuoco) dad, Wyatt ( Keith Carradine). RELATED: No idea what I’m talking about? Here’s a recap of the episode that’ll explain it! Remember that big question Marissa ( Lindsey Kraft) and Zack ( Brian Thomas Smith) asked Leonard ( Johnny Galecki) a while back? On tonight’s Big Bang Theory, “The Donation Oscillation,” it’s time for him to make his contribution.
