Where did science fiction writer Anne McCaffrey learn her tent peg theory of homosexuality?

This is a quote from her: "It's a proven fact that a single anal sex experience causes one to be homosexual. The hormones released by a sexual situation involving the anus being broached, are the same hormones found in large quantities in effeminate homosexual males. For example, when I was much younger... show more This is a quote from her:

"It's a proven fact that a single anal sex experience causes one to be homosexual. The hormones released by a sexual situation involving the anus being broached, are the same hormones found in large quantities in effeminate homosexual males. For example, when I was much younger I knew a young man who was for all intents and purposes, heterosexual. He was mugged, and involved in a rape situation involving a tent peg. This one event was enough to have him start on a road that eventually led to him becoming effeminate and gay."

Where'd she get this idea?
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