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HIV Risk from Toilet Seat

Question: 

May I begin by thanking you for all the help you give to other people, and please forgive me if this is an inappropriate request for your website. However may I ask a question for clarification please ?
If my partner uses a toilet and if she should sit in hiv infected semen (or other bodily fluid) or gets this fluid on her skin, could this hiv then be passed on ?
The reason for my concern is that my partner used a toilet but very soon afterwards, as part of becoming intimate, I licked her legs, behind her knees and thighs. However I am worried since these parts of the body may have been in contact with the toilet she has used (toilet seat or the toilet itself), and any hiv may not have been inactivated due to lack of exposure to air (i.e. the toilet lid may have been down).
I would appreciate a reply at your convenience, but above all would like to thank you for your time and attention. I apologise if my questions appear silly, and genuinely do not wish to waste your time - I just wanted to clarify any risks involved should this situation arise. I hope the way I have written my question(s) make sense. May I also add that I would be more than happy to arrange a donation to your great cause.
Thanking You and Kindest Regards.

Answer: 

Hello,

Thank you for your inquiry. From what we gather from the question, you are asking about the risk of acquiring HIV through contact with a toilet seat. From the information given, this scenario is no risk (transmission of HIV is not possible in the given scenario), as any bodily fluids left on a toilet seat would be exposed to oxygen, and oxygen exposure renders HIV inactive. Even if the toilet seat was down, there is still exposure to oxygen, and HIV is rendered inactive outside of a completely oxygen-tight vessel or an air-tight container (eg. the inside of a syringe).

If you still have any questions or concerns about your experience, please refer to your family physician.

Thank you and have a good day!

AIDS Vancouver Helpline/Online, Sara