When Paul Lafargue was living with the Marxes in 1866, he made his intentions regarding Laura quite plain so that the whole family knew. Marx was not so impressed, so he wrote:
If you wish to continue your relations with my daughter, you will have to give up your present manner of ‘courting.’ You know full well that no engagement has been entered into, that as yet everything is undecided. And even if she were formally betrothed to you, you should not forget that this is a matter of long duration. The practice of excessive intimacy is especially inappropriate since the two lovers will be living at the same place for a necessarily prolonged period of severe testing and purgatory. I have observed with alarm how your conduct has altered from one day to the next within the geological period of one single week. To my mind, true love expresses itself in reticence, modesty and even the shyness of the lover towards the object of his veneration, and certainly not in giving free rein to one’s passion and in premature demonstrations of familiarity. If you should urge your Creole temperament in your defence, it is my duty to interpose my sound reason between your temperament and my daughter. If in her presence you are incapable of loving in a manner in keeping with the London latitude, you will have to resign yourself to loving her from a distance. I am sure you will take the hint (MECW 42: 307-8).