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And the cases where a partner didn't disclose their status, or didn't know that they were contagious, or they hit the shitty jackpot and were infected despite best-effort and best-practice measures?

Yes all those reasons contribute more to HIV infections than promiscuous sex with multiple partners.

> Please do tell use about these nonsexual ways.

Sharing syringes (e.g between drug users).

I assume parent means contaminated blood transfusion. That was the primary non-sexual vector before screening and excluding known high risk populations from blood donation was adopted.