>Can the above somehow be related to the fact that some women report to
>have problems with MER during ovulation and/or menstration? (it takes
>longer before a MER occurs and less MERs occur anyway).

Good question.  I know that women tend to complain of lower milk supplies
(and fussier babies) during their periods, and I know that MERs are less
noticeable when milk supply diminishes.  Perhaps the hormones cause the
temporary decrease in supply, and with less stretching of the ducts, a
smaller response to oxytocin and less sensation overall?  I'm
speculating, of course; though I was in "tutorial mode"  ;-)   I am also
the perpetual student of the mysteries of lactation!

-Lisa