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Q: As far as I understand, there must be some body fluid contact, however small. AIDS virus is found in blood, semen and vaginal secretions but oddly enough, NOT saliva.

"Fluid contact" usually involves sexual intercourse, but may also happen when sharing needles, recieving contaminated blood etc.

Not having sex at all provides the best protection, condoms are second best. In addition to condoms, good lubrication is also important, as it prevents the condom from breaking, and small skin abrasions from occuring. Your best bet is to use condoms and KY Jelly -- it's cheap & easy to apply (I wonder why so many people don't use it!).

Condoms are not 100% safe, of course, but neither is driving to work in the morning.

AIDS risk from unprotected o-r-a-l sex is low, but there are other things you can catch that way. A-n-a-l sex is very risky, abrasions are more likely to appear since lubrication often inadequate.

( Yahoo Answers censors some words, hence the dashes. What a silly policy -- does AIDS advice need to be censored? I bet if I used really, really, nasty language, the filter would not catch them. )
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