My wife is a nurse who specializes in HIV and HIV related illnesses.
One of her patients contracted HIV at age 16 from heterosexual intercourse that was unprotected. It was her very first sexual experience. She died five years later.
Of course.... that was her story.
Just do some google searches on odds of contracting hiv and you will see that the stats as Denny presented them are repeated numerous places. My wife says facts like this are dangerous and that the only safe sex is SAFE SEX.
If you look at the facts surrounding HIV transmission, gay sex seems to be the most likely way for Magic to have gotten the virus. Remember him and Isiah kissing on the cheek?