Thank you for your inquiry. From what we gather from the question, you were asking about acquiring HIV from mutual masturbation and unprotected oral sex. From the information given, this scenario is determined to be Low Risk (Evidence of transmission occurs through these activities when certain conditions are met).
HIV transmission occurs when bodily fluid containing HIV has direct access to the bloodstream of an individual who is of HIV negative status through a High Risk activity.
In this scenario you are inquiring about an encounter that has happened in the past. The act of mutual masturbation is determined to be No Risk as bodily fluids are not exchanged through this sexual act. The act of unprotected oral sex is considered to be Low Risk due to the exchange of bodily fluids.
You mention being asymptomatic and wondering if the late symptoms could be attributed to HIV acquisition. It is important to know that HIV acquisition does not have any set of universal symptoms and may vary from person to person (1). HIV symptoms can mirror other viral infections like the flu and can be due or explained by other things; this is why taking a test is the only way to know your status (2).
You stated that you have taken blood tests, but not specifically a HIV test. It is recommended to take an HIV test once a year or more depending on your level of risk activity to be aware of your status.
Recommendation: Refer to a health care provider for HIV testing.
AIDS Vancouver Helpline/Online, Danielle