@professortom Funnily enough, this idea was used in the first Jurassic Park film. A character can't find the matching fixing for his seatbelt so he improvises by tying it around his waist. This is a precursor to the information that the dinosaurs can't breed because they are all female, but this is challenged (life finds a way) because some species of frog can change sex if needed for reproduction.
If only some humans understood sexual dimorphism in mammals.