It’s a boy. It’s blue. It’s a girl. It’s pink.
Why in the world did anyone standardize the English word blow, associate it that with oral sex, blow-job, and therefore associate oral sex to the color blue because blue/blow sound and look the same. Why? Why mess with a color like that. Why not say red-job, purple-job, orange-job or some other color that’s not associated with genders. That’s one of those weird association things that everyone’s bound to speaking English.