If a couple have anal intercourse the risk of infection is greater than with vaginal intercourse. If a woman with HIV has sexual intercourse without a condom, HIV could get into the man's blood through a sore patch on his penis or by getting into the tube which runs down the penis. If there is any contact with blood during sex, this increases the risk of infection. For example, there may be blood in the vagina if intercourse happens during a woman's period. There can also be bleeding during anal intercourse.
Safe sex means sex which is absolutely safe.
Lots of activities are completely safe. You can kiss, cuddle, massage and rub each other's bodies. If a person sucks the penis of an infected man, for example, infected fluid could get into the mouth. The virus could then get into the blood if you have bleeding gums or tiny sores somewhere in the mouth. The same is true if infected sexual fluids from a woman get into the mouth of her partner.