And from him, they got it. The guy dipped his brush in testosterone. He was a superb artist in every other way. A great deal of his stuff ended up in the Prado, and it’s worth a visit for that reason alone.
Of course the Prado is an essential place to visit for all sorts of reasons. Allow at least 6 hours, and probably several days.
There are several other Rubens in Madrid, at the Real Academia, the Thyssen, the Descalzas Reales (often missed, dont), etc.