They experience massive trauma even in the womb because of the huge anounts of stress hormones from their birth mother trying to decide whether to keep, abort or release for adoption. So many have serious trauma induced psychological and attachment issues from birth even if adopted into a good family. Compounded many times if the family is corrupt/dysfunctional.
I do a lot of work in the gay and lesbian community. Over 90% of the many lesbians I worked with, the mother was angry at the father while pregnant.