dental dams are the suck; the latex is too thick, keeping it stretch is lame and they don't take very good. ya best other options are cling film or splitting a non-lubricated condom down the middle.
cling film *like saran wrap* is the way to go and the cheapest. just pull off what you need, cover the playing field from booty to coochie and have fun. a bit of lube on her bits will help the cling wrap slice over her skin and should make up for some of the sensation lost from the lack of skin on skin contact.
ml
HPV, in one form or the other is very common, but not all strains of HPV cause cancer. he's got every right, hell he's responsible for, protecting his sexual/general health.