Penny and Raj bring Sheldon out into the World of Sex.
Completely new series: Sheldon & Leonard meet Penny.
One night with Kaley Cuoco (and Penny).
Bernadette develops a new drug, among other things.
Round two with Kaley Cuoco in Los Angeles.
Sheldon's twin sister Missy comes to visit.
Penny helps Sheldon prepare for Amy.
The girls have a contest to see who can make more tips.
Penny gets a movie role
Penny experiments with her friends.
Costume contest on New Year's Eve.
Penny in a jam.
Penny shows up on Leonard's door step drunk.
Melissa wants to remake a famous porn flick.
Uncle Mark visits while Howard is out of town.
Big Bang's Melissa Rauch feels naughty after Maxim shoot.
Penny takes different jobs.
The girls slumber party turns sexy.
A lucky contest winner gets to meet his dream girl.
Penny gets a part time job.
On the set of 'Big Bang Theory' Kaley Cuoco is getting horny.
Penny in a foursome, Sheldon with Lalita & later with Penny.
Penny plays with Leonard & Sheldon takes her too.
Howard leaves and asks Raj to take care Bernadette.
A surprising Valentine's Day.
Bernadette convinces the board to promote her.
Penny discovers voodoo.
Penny marries Leonard.
Penny conducts an experiment with Sheldon.
S.3-Ep.8. Penny slips in the shower.
Bernadette tries to replicate Penny's experiment.
Penny's Halloween Party, Howard & Christy, plus More.
The seed is planted for Bernie's website.
Penny lands a part.
Penny's first Halloween party in 4B.
Penny put up her only asset to lease Apt 4B.
Penny with Doug; Leonard with Leslie and more.
Stuart's NYE party bangs in the New Year.
Penny has some fun at Howard's expense.
Raj visits Uncle Mark and Bernadette.
Penny helps Bernadette.
Penny's family comes to town for the wedding.
Dinner at the Wolowitz home.
Leonard hooks up with Leslie and Penny after her breakdown.
The Best Friend Experimentation.
Penny, Bernadette find new fellas after breakups in Season 3.
Taking pictures during sex with Kaley Cuoco.
Spreading the joy.
Penny surprised Leonard. Will he get his fantasy come true?
Raj and Penny hook-up, then Ramona with Sheldon and more.
Penny gets different jobs.
Penny's Father Visits and Girls Have a Wild Night Out.
Penny with Leonard & Mike; Missy & Penny w/ Raj & Leonard.
Penny does Sheldon & Stuart, Alicia upstairs does the rest.
Big Bang gang decorates the Christmas tree.
Leonard and Howard switch, Penny does Stuart, and Stan Lee.
Bernadette & Howard's wedding brings plenty of surprises.
Penny convinces Raj she discovered the comet.
Big Bang Theory's Penny apologises to Howard as only she can.
Things start to heat up.
Melissa remakes a porn classic.
Priya gives Leonard her ass. Sheldon has Amy, Penny & Bernie
The boys explore what's always been there
One take on how Penny and Leonard finally hook up.
Nonstop Sex at Conference in Big Sur & Afterwards.
Rod introduced Penny to Tony.
Penny gets to meet Howard's Uncle Mark.
Everyone gets to celebrate Leonard's surprise birthday party.
Drunk sex to friends with benefits.
Penny attends high school reunion.
Leonard with Dr. Stephanie Barnett and much more.
Penny looks for work.
Priya with Raj and others. Penny does audition of a lifetime.
Penny experiences two threesomes and a foursome and more
Penny & Leonard's Massage Fantasy Orgy: The Final Chapter.
Penny with Sheldon & Leonard; Raj & Howard with Goth Girls.
Bernadette builds content for her new website.
Sheldon makes sure Penny's birthday goes out with a 'bang'!
Leonard & Priya double team Bernie & much more; Raj & Penny.
Everyone has sex, just not with their partners.
Penny, Bernadette & Amy tease the guys in Disney costumes.
Leonard set up his wife for a threesome.
Not surprising...Sheldon is an alien.
Penny does Dave, Doubles Leonard & Sheldon and Sheldon again.
Zack Joins Justice League on New Year's Eve Ladies Love it.
Penny fucks her classmate. Leonard beds Alex.
Raj gets Some, Penny with Howard & Leonard and much more.
Bert gets Amy's Ass, Penny is gangbanged & shares Leonard.
Penny visits Leonard at work, twice. Bernie & Howard & More.
Leonard talked Penny to have fun with her Ape-ist Fan Boys.
Sheldon with Beverly, Raj & Leonard with Summer Glau & More.
A Thanksgiving where 3, 3somes takes everyone to new heights.
Howard & Bernie/Penny with Sheldon & Leonard & Much More.
Howard's Fantasy Parodies Start Great but end up in Disaster.
Raj dominates Penny and Amy. Penny does Sheldon and more
Penny with Dominant Leonard, Amy & Sheldon Star Trek.
Leonard enjoys blind date Joy and later Priya.
Penny tricked into a foursome.
Penny fucks the graduate; Mary too. Bernie triple teamed.
Bernadette films in the park for her website.