For as in the days that were before the flood they were eating and drinking, marrying and giving in marriage, until the day that Noe entered into the ark (Mat 24:38)
That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose. (Gen 6:2)
Getting married is an every day event, just like eating and drinking. There’s nothing in the text that implies the marriages referred to are anything out of the ordinary. In fact, the plainest reading of the text is that marriages are used because, just like eating and drinking, they are such a completely ordinary event.
I’m not saying that it couldn’t be an additional implication, but there is really nothing to lay your finger on that points to that which isn’t more easily explained by a less extraordinary interpretation.