Sexuality
Klingon mating rituals involve dominative and combative attitudes and rituals. parmaqqaypu' (singular parmaqqay) are chosen mates for dedicated recreational sexual congress. As the Doctor from Voyager commented, it is considered a good omen if during the wedding night a clavicle is broken. A Klingon biting someone indicates they desire to mate.
In the episode "The Dauphin" from Star Trek: The Next Generation, Worf states that the mating ritual consists of a woman roaring, throwing things at the male, and occasionally clawing at him while the male reads love poetry and "ducks a lot".
Klingons are known to have sexual relations with humans, with the character B'Elanna Torres being an example of a Klingon-human hybrid. However, Torres is a Klingon on her mother's side. In the episode "Justice" from Star Trek: The Next Generation, Worf states that he must resist his urges for "general sex" as the only women available to him are human females, who are more "fragile" than Klingon women.
Read more about this topic: Klingon Culture