Actually, that is a very good point - she might not have remembered. Not everyone is prepared to be questioned about their sexual past in an interrogation-style fashion and not everybody is necessarily up to date on their sexual resumes 24/7, just as my professional resume has not been updated since last year and my LinkedIn list of skills and expertise areas is not up to date and I would need to give some thought to updating it because I do not remember everything I have ever done professionally, and I especially do not remember one-off assignments.

It she had one threesome rather than a steady stream of threesomes, then it was like a one-off assignment rather than a core area of expertise that defines the professional experience in a meaningful way, and it would be easy to forget.