Penny struggles to make a connection with Leonard's mother on The Big Bang Theory. "The Line Substitution Solution" is the 23rd episode of the show's ninth season.
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The boys take fencing lessons and Sheldon ends up in an awkward position with the instructor on The Big Bang Theory. "The Perspiration Implementation" is the fifth episode of the show's ninth season.
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They made it to Vegas, and apparently did tie the knot, but will we actually get to see Penny and Leonard's wedding? It seems like with the build up, we'd get a little more. Remember the perfect rooftop wedding that Howard and Bernadette had?
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Well, it seems as though they tied the knot! We really weren't sure if it would happen, but apparently Leonard and Penny do get married in Vegas. Still, they have a lot to discuss, and it isn't going to end here. How will Leonard's confession affect their relationship?
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Sheldon pushes Penny and Leonard to set a date for their wedding.
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Penny and Sheldon design an experiment made to get the participants to fall in love on The Big Bang Theory.
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The girls remember some of their most embarassing moments on The Big Bang Theory. "The Troll Manifestation" is the 14th episode of the show's eighth season.
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Sheldon and Leonard go dress shopping with Penny and Amy on The Big Bang Theory. "The Space Probe Disintegration" is the 12th episode of the show's eighth season.
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Sheldon says goodby to "Fun with Flags" on The Big Bang Theory. "The Champagne Reflection" is the tenth episode of the show's eighth season.
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Amy and Bernadette discuss female scientists who use their sexuality on The Big Bang Theory.
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Simon Helberg plays Howard Wolowitz on The Big Bang Theory
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Kaley Cuoco-Sweeting plays Penny on The Big Bang Theory.
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TBBT Quotes

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.