I have to agree with Sweetbee here! As a professional in a Healthcare environment which deals exclusively with rape and sexual assault victims I too shared your paranoia. What is important to remember that environmental contamination is so close to zero I'm not even sure there's a statistic that shows how tiny the possibility.
As ^^ says the virus can only be passed open wound to open wound. Being in my line of work I can also relay that even that does not guarantee an infection. I have know many patients who have experienced this and gone on not to be infected.
Please do not worry!! :)
I understand your fears, as a parent this is normal.
But once HIV hits oxygen it dyes. activities as like tattoos, (tmi) but sex from the rear, " meaning he has a cut is is open and ripes you" or open wound to open wound has made contact.
Hope this helps.