this is a normal reason. but sometimes some people really be out here complaining that the dick's too black, the dick's too pale, too long, too chubby, analysing the veinage area, shaming the meatus tilt, and malding about nut viscosity and as a consequence they can no longer nut to a model. these people get too hung up on it, moan about it for forever then try act like they're the straightest people alive.As a black man I don’t understand it either I think they watch videos imagining that they are the black guys with the bbc banging the girls just a guess
can also interchange dick with dildo here, same shit
EDIT: replied to wrong guy, thats why i swapped comments.

