Well, souls sto, I see what you are saying, and perhaps I am projecting a bit (as you seem to imply), but within the first paragraph of the article is this:
Mate copying is the idea that an individual’s decision to mate—or form a relationship with a potential partner—is impacted by observation of that person in a relationship with another, or knowledge of their romantic history.
This led me to google "Mate Copying" (I had heard of "mate poaching" before, and wondered if this was a similar phenomena) and fell down the "mate choice copying" rabbit hole. Apparently, this study began with young female guppies, after the young female guppies watched the males (many that they had previously rejected) partner with older female guppies, the young female guppies "changed their minds" and pursued the male guppies partnered with the older female guppies.
Thus began the research into human "mate copying", which lead to articles such as "I Want What She's Having : Evidence of Human Mate Copying." (must has access to the journal, or access it through library/university to see the whole thing, but the abstract sums it up), and many others, including things like "Mate Copying: Why Single Females Find Married Males Attractive (also cites many of the same studies).
Then there is the actual definition of "mate-choice copying", which is defined as:
mate choice copying
Mate choice copying describes a non-independent mate choice event. Mate choice copying is said to occur when the likelihood that one individual will mate with a particular individual increases or decreases based upon observing a sexual interaction between the "target" and another individual. …
Personally, I have never, EVER dated someone after watching them date someone else. I ALWAYS date outside my social circle, I'd rather expand my own social circle than date someone whose ex I know (awkward).
As for your assertion that this only applies to "previous" partners, I think your definition of "previous" is being taken too literally. Previous is the "one before/one preceding", not the one who you've divorced/ended your relationship with, etc. I AM the "previous" partner, because I came BEFORE OW. Nowhere is the definition of previous the same as FORMER, or PAST (as in relationships), so I don't know how you came to the conclusion that it refers only to an "ex partner".
Also, after reading all of these replies, I fell into the OW rabbit hole, and looked her up on Pinterest (where I have her blocked, after she sought me out and began repinning all of my pins), and SURPRISE, her last "pin" is a quote that says:
"There is nothing quite as sexy as a man who loves his wife.
Every woman in the room wants to be her."
Not to suggest that this is scientific evidence, but for me, point taken.
[This message edited by Want2help at 6:25 PM, September 10th (Wednesday)]