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The continent of Africa would tend to disagree with such an assertion.

Heck, in some countries, more than 15% of HIV infections are contracted at birth.

https://www.verywellhealth.com/hiv-statistics-5088304

Spoken like someone whose knowledge of the world ends at the US border. Hate to be the bearer of unpleasant news, but there are parts of the world where HIV was mostly a heterosexual disease. The nature of the main infected population depended upon how HIV was first introduced a country and what cultural behaviors helped or hindered its spread.

Even in Eastern Europe currently most HIV transmissions happen with heterosexuals. I was surprised to learn that in the Western countries it is mostly spread by MSM (men having sex with men) and IDU (intravenous drug use).

This certainly was not the experience of other countries such as South Africa where the majority of transfer (roughly 80%) was via heterosexual transfer.

Reference: https://pubmed.ncbi.nlm.nih.gov/8420583/

This is plain false. The majority of infections have been across heterosexuals, and also by blood transfusions.

Plenty of people got it from blood transfers, among other things.