A/N: Very minimal spoilers in this story. Post 2007 movie.
There were some things in the universe that you couldn't even understand even though you were countless eons old, even though you were a robot. Human reproduction, for example, was one of them. Practical as it was, it wasn't exactly discussed in the open among the pubescent teens known as Sam Witwicky and Mikaela Banes. Which made Ironhide curious; which in turn, made Ratchet curious, and eventually Prime himself was curious about the act. They may have downloaded every bit of information on the Internet, but the explanations for the act itself varied, along with culture specific views about it. Which made the millennia old robots even MORE curious.
Finally, this curiosity boiled over. One day, while out with Sam and Mikaela, who were riding in Bumblebee, Ironhide and Ratchet both asked for them to stop in a private spot. Thank Primus Bumblebee was driving because the teens were, once again, obeying their hormones more than watching the road. They had a habit of doing that, but who could really blame them? Mikaela and Sam found each other sexually attractive.
Sam watched as the various robots came to a stop and Transformed. His curiosity was most definitely aroused, "Okay, why are we stopping?" he asked as he got out of Bumblebee, Mikaela right behind him.
Suddenly the opening lyrics for, 'Can't Get Enough of Your Love Babe' started pouring out of Bumblebee's speakers and Sam knew what they wanted to talk about the moment he heard the first beat. Rubbing one hand through short dark hair and stuffing the other in the pocket, a light pink sheen appeared on his cheeks. Mikaela, on the other hand, wasn't the least bit embarrassed.
Mikaela let out a long sigh. It had been good for her that she had to put up with her Mom's version of 'The Talk' a couple of times. "You see, when a man and woman are married and of age…" And the millennia old robots sat at rapt attention, like toddlers listening to their favorite story. Some parts were confusing, even to metallic beings as old as they are, particularly Bumblebee. And most let out a simulated gasp as Mikaela had mentioned that even the backseats of automotive vehicles were as good a place as any to 'make love' as she put it. Even when she finished, Bumblebee still had some questions for her, but couldn't find the appropriate radio broadcast or sound byte to ask them, and his vocalizers still hurt. He needn't have worried though, because…
Bumblebee would find out what Mikaela was talking about a few years later. A newly married Sam and Mikaela Witwicky celebrated their honeymoon…In his backseat.
Short sweet and to the point as I like to put it. Well, I hope you enjoyed!