It's a study of self-assessed ratings of sexual pleasure, orgasm intensity, and similar items by area. The study included 81 healthy men. One weakness of the study was that only eleven men were uncircumcised; this shouldn't bias the results, but it does mean that the foreskin's scores are known with less precision than those for other areas.
The key results were as follows:
Overall discrimination between genital areas was highly significant (mixed-model anova, P = 0.001) for ratings of 'sexual pleasure', 'orgasm intensity' and 'orgasm effort', but was not significant for 'discomfort/pain'. Ranked by degree of 'sexual pleasure', the area 'underside of the glans' was highest, followed by 'underside of the penile shaft', 'upper side of the glans', 'left and right sides of the glans', 'one or both sides of the penis', 'upper side of the penile shaft', 'foreskin' (11 subjects), 'skin between the scrotum and anus', 'back side of the scrotum', 'front side of the scrotum', and 'around anus', but not all pair differences were significant. The rank order was similar for 'orgasm intensity', but less similar and with fewer significant pair differences for 'orgasm effort'.
What this means, effectively, is that the foreskin is the least sensitive of all areas of the penis, when "sensitive" is defined as "capable of producing sexual pleasure or orgasm".
This is no great surprise to me. It's entirely consistent with the bulk of evidence indicating that the foreskin can be removed without adverse effects on sexual satisfaction, which would seem inconsistent with the foreskin playing a major role in sexual pleasure. But it may come as a surprise to those who were mislead by studies such as Sorrells et al., which (erroneously) presented the foreskin as the most sensitive part of the penis. Why?
Well, as Prof. Morris and I noted (among other points) in our critique of Sorrells' paper:
The authors conclude that ‘circumcision ablates the most sensitive parts of the penis’, although they only tested the ability of subjects to detect the lightest touch. Meissner’s corpuscles, being light-touch receptors, would be expected to cause such a measurement to exaggerate the sensitivity of the prepuce. However, sensitivity, particularly when discussing erogenous sensation, depends on several different modes of stimulation and their interaction. In addition, sexual sensation depends upon the types of mechanical stimulation generated during intercourse, which might in turn be influenced by circumcision status. Thus circumcision has the potential to either increase or decrease sexual sensation.
Put bluntly, the two studies measured completely different things. Sorrells et al tested response to having a nylon filament pressed against the skin; Schober assessed response to sexual stimulation. And the two are not the same at all.