[cherry]

post your data.......

[deleuze03]

hmmm if you can access the MEDLINE database you can find the research, but I can only give you the abstracts to the studies...

A study from 1992 of heterosexual undergrads at a midwestern university showed 80% were non-virgins, and that of these, 17% of males had had anal sex, 22% of females, in the last year....http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1628714&dopt=Abstract&itool=iconabstr

then there is this http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2059146&dopt=Abstract&itool=iconabstr