While Optimus was in his office, he came across something called "Seven Minutes in Heaven" and being the curious bot he is, he went to the main base until he found you and Miko being girls

Optimus: Y/N, Miko, I have a question.

Miko: Yeah, Optimus?

Optimus: What is "Seven Minutes in Heaven"? Is it some human game?

The entire base, including the Autobots, went silent. Nobody knew how to explain it without sounding disgusting or make it awkward