I took the IA term to mean a one-way EA, meaning one party (and for us here, it would be the walkaway/wayward spouse) participates in it, views it and feels it as an EA, maybe even wants it to go PA, but the affair "partner" doesn't return the emotions/feelings.

So, all the infidelity of a typical affair from the LBS' perspective, but maybe slightly better because it might give the wayward the sense that (s)he isn't such hot $hit afterall because he/she couldn't get the partner interested?

Me: 46
W: 44
Married: 17
Together 21
D13; S10
BD: 03.03.15 (Not attracted to you)
Almost 2 years trying, alone, to save marriage
Status now: Divorced (effective 06.13.17)