Thank you for your inquiry. From what we gather from the question, you were asking about various sexual activities between a serodiscordant couple (one partner is HIV positive and the other is not). From the information given, this scenario is deemed to be No risk (Transmission of HIV is not possible in the given scenario). This is assuming that P has been adhering to his ART medication.
The best resource for this question is the PARTNER study. It followed over 800 serodiscordant couples, where the HIV positive partner was on virally suppressive ART (1). The researchers found that there was zero transmission of HIV among the partners even though there were 58,500 instances of unprotected sex reported (2). If you are HIV positive and undetectable you are not able to transmit the virus through sexual intercourse and therefore undetectable equals untransmittable (3).
AIDS Vancouver Helpline/Online, Rashell
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1.) PARTNER Study
2.) Understanding the PARTNER Study