If a man does sex with a woman who is infected with HIV virus, what is probability of man infection (%)?

100%

I think 100% but I'm not sure... maybe 99% because there's always a little possibility

high

Less than one percent. But double wrap it anyway.

may b

if he is unprotected? bout 100%

First a man does not "does sex" with a woman. He "has" sex.

Second.....I know you must be smarter than you appear. Long story short............you "need" to get checked!

200%

too high too take the risk

Relatively low and lower still if the man is circumcised but having unprotected sex is a bad idea and sooner or later you will get something you don't want

OK if you know she has HIV why even think of going there. if it is the love thing put a rain cap on the wiener......you probability of catching the disease is the same as your probability of being stupid for thinking about it..............100%

very high and totally not worth even attempting it.

just another point, people like jonnyraven shouldn't answer questions like these, and put peoples health at risk. low chance and lower when circumcised?! wtf?
what does not having a foreskin have to do with exchanging body fluids pray tell?

First, some of these answers are so wrong! Where did you guys here all of this! Okay, the chances are lower than from man to woman, but still can happen. If she is having her period, don't do anything. The blood could enter your penis and infect you. Also some vaginal secretions transmit the disease. DO NOT DO IT!!!!!!! Using a condom lowers the chance, but it sill isn't worth it. Do you want the disease? If you still have sex with someone you know has HIV, get tested, and you won't be able to get tested for three weeks after. That is how long it takes for the virus to take over. It isn't worth it.

The likelihood of transmission is actually surprisingly low but, as the other posters have pointed out, the impact is so high that nobody should risk this kind of unsafe sex.

There are no accurate figures out there for female-to-male transmission, but working estimates suggest that there's around a 1-in-500 chance of transmission, assuming (and this is very important) that the woman is not on her period, and the man has no cuts or abrasions on his penis. And, as someone else said, there is evidence to suggest that being circumcised helps reduce the chances of transmission too.

if safe sex is not practiced, the probabilty of contracting HIV is quite high. men and women should both practice safe sex. the numbers of diseases out there is staggering. there isn't any sexual act that is good enough to case you to be active without a condom. they do save lives.