All the evidence points to Darwin as a generally healthy man with a strong, active libido, normal sexual function, and prodigious fertility.
We may dispute what Darwin felt or thought in the privacy of his study — but the bulk of his writings fall clearly into advocating for one perspective: naturalism.
What if there is genuine directionality in mutation? An important paper addresses the subject.
Did four-year-old Angela climb Everest by herself? No way.