[Mrs. Don-o]

I'm not sure I understand your point. The study finds a statistical correlation between childhood trauma and later homosexual or bisexual behavior. One could reasonably infer that there was childhood trauma and, correlatedly, homosexual and bisexual behavior in the non-modern societies you mentioned.

That doesn't make this behavior pattern inevitable. I don't think any human behavior pattern is literally inevitable.

[Ben Mugged]

The study is fundamentally flawed. First they start off with homosexuals and ask them how many were sexually abused as children. They should sample the entire spectrum of adults regardless of sexual preference. The sample should show how many who were abused as children eventually became homosexual. I give little credulity to studies that seem to have the result in mind before the study is started.

I know of many adults who experimented sexually as children (not with adults) some as early as the age of six. This is not normally classified as "abuse" or at least not in the 1950s. They experimented with both sexes and yet almost all (around 99%) ended up heterosexual. Mind you this is personal relationships and not some foundational study. It is from my own personal experiences that I draw my conclusions from they are not spoon fed to me.