17.Jul.2010 Noises during orgasm
The following abstract is from a recent study on why women make noises during orgasm. Personally I think sometimes women create noises as part of communication and some types of relating are positive and others negative. Also noises during orgasm can heighten the experience. Think this study was extremely narrow in scope.
http://www.unboundmedicine.com/medline/ebm/record/20480220/full_citation/Evi