Re: Worf & Dax’s Descendants in the Episode Children of Time
Trills and Klingons can't have children without genetic manipulation which would not have been available on the planet.
With resources at the station, Bashir could help Jadzia & Worf have children (see 'Tears of the Prophets'), but not on the planet.
And we know that Klingons can breed with humans (see TNG 'The Emissary' and Star Trek: Voyager). Klingons and Klingon/human hybrids can even continue to have children (see TNG 'Reunion').
So, obviously, Jadzia & Worf had an open marriage. They loved each other but had sex with human members of the crew to keep the colony goin'.
Try as I might, I just can't picture Worf going for that.
"I was never a Star Trek fan." J.J. Abrams