It’s a thing, yeah.

Edit: sorry, that was a crap response. Felt bad, came back.

Yes, it is pretty directly shown that they consummated their marriage. While the act is obviously not on screen, the scene immediately after leaves no doubt.

In the older movie version, it’s even more obvious than the play. That’s the 1968 one that I’m referencing. There are older versions than that, iirc, but that one is kinda the default movie version to point to since it stays relatively close to what a stage production would be, if done as a movie. Compare that to the DiCaprio version that’s true to the feel, but strays from a more traditional interpretation.

Anyway, yeah, two idiot kids got married and did the deed afterwards.

Did you miss the part where Juliet goes on about “sheathing” a “sword”?