Educate yourself man. HIV incidence via bbbj is extremely extremely low, even moreso for the male.
Consult this chart for a rough idea of what risks are present for each activity. Note that you'll need to do more research to determine infection rates, the chart just tells you what's possible.
If it's HIV though you're worried about from a bbbj I think it's clear you need to educate yourself. The CDC website is a good resource.
http://www.sfcityclinic.org/stdbasics/stdchart.asp