I think Darwin left out one of his key reasons -- among his papers was a recipe for boiling rice.
"Reasons for not marrying: freedom to go where one liked; choice of Society & little of it. - Conversation of clever men at clubs - Not forced to visit relatives, & to bend in every trifle. - to have the expense & anxiety of children - perhaps quarrelling - Loss of time. - cannot read in the Evenings - fatness & idleness - Anxiety & responsibility - less money for books."
But the arguments for a union won the day: "Children - (if it Please God) - Constant companion, (& friend in old age) who will feel interested in one, - object to be beloved & played with. - better than a dog anyhow."He married Emma in 1839 [six years after the checklist -- Lak] and they had 10 children.
Darwin on Marriage
Charles Darwin's papers have been placed online. Among his papers: a checklist Darwin made to decide whether or not it was worth getting married: