I ejaculated will I get aids if the woman had aids, my penis was touching her skin

Here is how AIDS is spread: "How does someone become infected? HIV can be spread through any type of unprotected sex (oral, vaginal, or anal) if one of the partners has the virus. This can happen when body fluids such as semen (), vaginal fluids, or blood from an infected person get into the body of someone who is not infected. Someone can become infected even if only tiny amounts of these fluids are spread. Everyone who has unprotected sex with an infected person is at risk of contracting HIV, but people who already have another sexually transmitted disease (STD) are even more at risk."

The risk is BODY FLUIDS - as you can see.

How Do People Get AIDS? (http://kidshealth.org/teen/sexual_health/stds/AIDS.html)

So yes, if you had sex with someone that has aids you can get it.