'The Big Bang Theory': Sheldon and Amy's romantic milestones

The Opening Night Excitation — Photo: Michael Yarish/CBS

The story of Sheldon Cooper (Jim Parsons) and Dr. Amy Farrah Fowler (Mayim Bialik) on The Big Bang Theory evolved over many seasons. From their untraditional meet-cute in season 3 to their first, well, big bang in season 9, to their wedding in season 11, the saga of "Shamy" was one for the ages — one that in classic Big Bang fashion was full of its fair share of awkward yet endearing moments.

Let's take a walk down memory lane as we remember the romantic milestones of Sheldon Cooper and Amy Farrah Fowler through their shared seasons of The Big Bang Theory.

01 of 09

The meet cute (Season 3)

THE BIG BANG THEORY — Sonja Flemming/CBS

At the behest of Raj (Kunal Nayyar) and Howard's (Simon Helberg) "blackmail," Sheldon begrudgingly agrees to meet Dr. Amy Farrah Fowler. When Amy warns Sheldon there won't be any physical contact, he offers to buy her a drink ("Tepid water, please.") and the rest is history.

02 of 09

The first date (Season 4)

It wouldn't be Shamy if it was run-of-the-mill, and, true to form, neither was their first date. Chauffeured and supervised by Penny (Kaley Cuoco), the episode marks Sheldon's first date with not just Amy, but anyone. Following that success, Sheldon makes the executive decision to move things to the next step: "to gift humanity with our progeny."

03 of 09

The breakup and makeup (Season 4)

Shamy begins and ends, and Sheldon gets a lot of cats to cope before Mama Cooper (Laurie Metcalf) swoops in and gets the two geniuses back together — platonically — to, at least, get rid of the smell of six cats.

04 of 09

The first handhold (Season 4)

In an attempt to gauge how Sheldon makes her feel — a.k.a. if she gets turned on by him — Amy holds his hand, but, alas, nothing.

05 of 09

The first romantic kiss (Season 7)

While they technically shared their first kiss way back in season 3 — during the same awkward episode in which they met — Sheldon and Amy didn't share a real, romantic, swoonworthy kiss until their train-bound smooch, just in time for Valentine's Day.

06 of 09

The first time (Season 9)

It took another two seasons from their first non-cringeworthy kiss for Shamy to finally — as Sheldon would say — engage in coitus.

07 of 09

The proposal (Season 10)

The Long Distance Dissonance — Michael Yarish/CBS

It's yet another season before Sheldon takes his relationship with Amy to the next level. Despite her attempt to thwart the couple's relationship, Dr. Ramona Nowitzki (Riki Lindhome) kissing Sheldon only pushes him to finally get down on one knee and pop the question...to Amy, of course.

08 of 09

The wedding (Season 11)

The Bow Tie Asymmetry — Michael Yarish/CBS

Leave it up to the two lovebird scientists to delay their wedding for a chance to nose out an undiscovered physics phenomenon. However, they eventually proceed down the aisle — with Sheldon's idol Luke Skywalker (well, Mark Hamill) officiating their marriage and Amy looking like a "pile of swans" in her white dress.

09 of 09

The big win (Season 12)

LOS ANGELES - APRIL 29: "The Stockholm Syndrome" - Pictured: Amy Farrah Fowler (Mayim Bialik) and Sheldon Cooper (Jim Parsons). Bernadette and Wolowitz leave their kids for the first time, Penny and Leonard try to keep a secret, Sheldon and Amy stick together, and Koothrappali makes a new friend as the gang travels together into an uncharted future, on the series finale of THE BIG BANG THEORY, Thursday, May 16 (8:30 - 9:00PM, ET/PT) on the CBS Television Network. (Photo by Michael Yarish/CBS via Getty Images) — Michael Yarish/CBS/Getty

First comes love, then comes marriage, then comes a...Nobel Prize. Sheldon and Amy spend their first stage of marriage earning recognition from the world's most prestigious award for their discovery of super asymmetry. Now, that's what we call a power couple!