Pain is a subjective experience. What is the measure of it? How do you define a unit of pain?
The most sensible approach is to define a set unit of physical damage, and measure the response. There are physiological responses (increase in heart rate and so on) that could be measured, but I would deem this an unreliable method of getting at the meaning of the question. Instead one is left making a statistical analysis of the percieved pain as self-reported by a large group of patients. Does everyone agree?
This makes the question practically impossible to answer, since the social standards to which men and women are held in reporting pain are clearly different. My personal interpretation of what I’ve seen is that it is acceptable for women to report levels of pain that, if men reported them, would be seen as whining. Others may disagree.
A few important variables, however, might include WHO the pain is being reported to. Men are often not open with strangers, even doctors, in reporting physical problems. This is borne out by the much lower rates at which men seek medical help than women (for the same conditions), a well-established pattern that often works to the detriment of men. On the other hand, I have observed some men to be total wimps when it was their wives or girlfriends they were complaining to. Women, too, seem to exagerate pain to their SOs. At any rate, any experiment would have to deal with the greater social pressure men have on them to be tough and downplay pain, at least in front of other men.
So I would make a distinction between pain reported in a medical study and pain reported in a more social setting where the dynamics are more complex (which seems to be part of the OP).
I could find no articles in PubMed that address the topic specifically, but there are some that seek to evaluate various pain treatments, and these often include gender as a variable studied. From my brief examination of abstracts, most of the studies found no particular difference in gender. If there were a male/female difference in pain perception, I would expect the gender with a higher threshhold to generally respond better to most treatments (the pain would not have to come down as far to reach acceptable levels).
On another note, I will say that in non-medical settings, like the family, my own observations can be sweepingly generalized to the following: Women “handle” illness better, men “handle” injury better. (Note that I’m not saying anything about who FEELS more of a particular kind of pain).
I rationalize this by noting that women’s bodies often act up on them (i.e. once a month); it’s a perfectly natural thing and they know it’ll get better. This prepares them mentally for other illnesses, like colds and flus and the like. For men on the other hand, illness has greater psychological impact: our bodies are betraying us, and we’re helpless to do anything about it! This isn’t right! It’s not supposed to be like this! Ahhhhhhhhhh! But when it comes to mechanical injuries - bruises, breaks, cuts, etc., men get a lot more socialization when growing up (especially in high school) to keep it to themselves. THIS we understand. No big deal. It’ll get better. Most women don’t get this lesson pounded into them to the same extent by their and peers (and adults for that matter).
Finally, a couple of biological notes. First, I’m aware of no physiological differences between the pain receptors of men and women. Can anyone correct me on this? (Receptors per skin area, firing potential, etc.) I’d be surprised if there’s any difference; I expect any variation, if there is one, to be thoroughly psychological.
Second, from an evolutionary point of view, if either gender is less responsive to pain it should be the males. They are much more disposable than females.