Well. To obtain the effect of finding out (at least 18) years later that one has daughters, among multiple possible scenarios, to say that right after the coitus, the guy was scared away by the father of the girl and was forced to a drunk drive to an almost deadly accident and then he miracolously woke up from a coma 10 years after to the utterly shock of his doctors... It's a bit of an overkill
We are in soap opera territory. Throw in an amnesia and a second life at the court of an arab sheikh and we nailed it
But again, i'm totally cool with it, i just wondered if that plot would have been used later or really the dev just didn't find a more day to day reason for not knowing MC's daughters.