In Voyager B'Elanna's mother is Klingon, her father human; Worf's main squeeze K'Ehleyr had a human mother and a Klingon father, both loving relationships (at least initially), so despite incorrect numbers of organs (I choose to believe this refers to a Klingon's secondary backup spinal cord!) and human fragility, it happens.
Obviously the context in Discovery is distinctly unpleasant, and may have more to do with power than actual attraction.
I really liked the Klingon starfighters, BTW. There were never enough fighters in Trek, even the Jem H'adar ones looked bulky and sluggish.