you could search "perineal massage"- at pub med and come up with several studies and some stuff that is not - but when I tried to narrow the search not all the articles showed up that would pertain- so you have to weed through a broad search or you could find a full text review and then find the supporting articles...
http://www.ncbi.nlm.nih.gov/sites/entrez
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here is a link to the New Mexico full text article- I just don't like randomized trials because I think that selection can be important
http://www.ncbi.nlm.nih.gov/pmc/arti...8/?tool=pubmed
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a bit sideways from massage but warm packs- look over the abstract when doing your search- I like to use warm packs too
Midwifery. 2009 Apr;25(2):e39-48. Epub 2007 Nov 26.
'Soothing the ring of fire': Australian women's and midwives' experiences of using perineal warm packs in the second stage of labour.
Dahlen HG, Homer CS, Cooke M, Upton AM, Nunn RA, Brodrick BS.
Sydney South Western Area Health Service, Eastern Sector, Australia.