In 1924, a 30-year old journalist on the Daily Express came to Cambridge aiming to interview Haldane. She was Charlotte Burghes, née Franken, and she had a young son, Ronnie. Haldane and Charlotte became lovers, but before they could marry she had to seek a divorce, a procedure that carried substantial social stigma at that time. A university committee resolved to strip Haldane of his readership, which was only restored by successful legal action.
From a review of a new biography of JBS Haldane. The article referred to in the title of this post is here. I know of no other branch of biology that can build so much, on so few assumptions.