Thanks for the link moonlightsky and the explanation.
It does make sense to me as I always find myself attracted to my older female ts - two so far. I am female and never had any love from my mother.
It does signify an unmet need or a desire for something they cannot provide.
When I told my first t that I loved her I wish she would have explained this to me.
I do however think it is possible sometimes for there to be an attraction without it being about unmet needs.