True. I wonder though which of the two is the most sexually personal question to ask?
Either question could be a minefield. To someone without a partner, possibly long term, asking about frequency of sexual activity with a partner might be a sensitive subject. On the other hand (pun not intended but fits with what I'm saying), to ask about frequency of masturbation could be taken by the patient to mean the doctor expects him to be without a partner, assuming he is left with masturbation as his only option. Some patients might actually feel insulted by that approach. That, or he might take it as a sign the doctor doesn't have a sparkling sex life himself and thinks it must be the same for everyone else.
I suppose the doctor should begin by asking if the patient has a partner at present. To ask directly about ejaculation frequency only through sex with a partner or only masturbation would be clumsy and inept.
I understand some past studies of the possible relationship between ejaculation frequency and risk of prostate cancer very much skated around the issue of ejaculation and was mainly concerned with what age the male patient got married and how many children he had, using these as the basis for some very unscientific assumptions about ejaculation frequency. Apparently, societies were far too delicate to cope with a question such as how often a man ejaculated. It was simply another one of those things that just couldn't be spoken of. How ridiculous.
From how it sounds, these studies were on very shaky ground, apparently assuming a man rarely if ever ejaculated before his wedding night. Before marriage, he rarely if ever masturbated. More children suggests more sex, and therefore more ejaculations, obviously in the vagina, performed in the missionary position, and with the lights off. 😁