If you read Christopher Hitchens' book The Missionary Position, you'll discover that Theresa was quite the sadist.
https://www.goodreads.com/book/show/58664511-the-missionary-...
https://www.goodreads.com/book/show/58664511-the-missionary-...
I have seen an attempted rebuttal around her behaviour, specifically responding to that book, but I suspect that piece was more an apologetic than an objective defence.