bbbj's are actually pretty safe. kissing one of these girls carries a higher risk of transmitting an STD. basically, nothing that can be contracted through oral sex can kill you. of the remaining STDs that can be caught from oral, you can also catch simply from skin contact. im sure it goes without saying, but DATY is also risky business.
knowledge is power, my friends.
heres a link discussing the facts - but as with everything you read on the internets...take the advice with a grain of salt. being safe isnt just about protecting your own health...it means your spouse/significant other stays safe too.