explain yourself/ves

hey straight normal male here, just curious as to how many people you identify if it is plural. could one person who identifies as they/them play a game of basketball against the other parts of themselves? why or why not? weird. if i text one person who identifies as many, do i have to repeat it for the others? how does sex work? can you be both genders? so do yall get multiple id’s for the other parts of yourself since you consider yourself more than one person? do you guys girls and whatever else you think you are have to pay taxes twice? can you go down single rider waterslides?