Cannabis is one of the few crops where male and female flowers grow on separate plants, and that quirk shapes everything about how its seeds are sold. Tomatoes or peppers carry both parts in every flower, so no gardener has to think about sexing them. The botanical word is dioecious, explained at https://queenfeminizedseeds.com along with the roughly even split of males and females that a regular pack produces. For flower growers half the natural population is unwanted, which explains the demand for feminized seed.