No it isn't a risk. HIV is unable to reproduce outside its living host (unlike many bacteria or fungi, which may do so under suitable conditions), except under laboratory conditions; therefore, it does not spread or maintain infectiousness outside its host.
HIV is transmitted by;
Unprotected penetrative anal and/or vaginal sex
Sharing works with other IV drug users
Mother to child
"host" meaning the penis in my case, correct?.....and the virus is instantly inactive thereafter?
No that is not what it means. The host was the other person that ejaculated on you.
does the virus become "dead" as it leaves?
HIV isn't alive, it is either active or inactive. Once HIV leaves the body and is exposed to air, temperature and pH change the virus becomes inactive and unable to infect.
Did you not take chemistry?
i did but don't remember...so its inactive in 1 sec