Every new born that can imprints on their mother, or whoever is the primary caregiver. As kimdl93 asks this does not account for the vast majority of people (and other mammals) being gender normative, or, as I prefer, cisgendered.

Most of us have fond memories of our mothers from early childhood. Most of us do not have the same memories of our fathers from this time. And yet most people are heterosexual, gender normative, and not at all uncomfortable with their sex.

I am often surprised why there is so much interest in this forum on why we are the way we are. Are gay males, lesbians, bisexuals so interested in why they are the way they are or is it just the T in the LGBT that is so curious? And why? Are we reluctant to accept ourselves as who we are? Do we think if we could find out we could somehow fix ourselves and just be ordinary heteronormative cisgendered folk?

Just asking. Sometimes a lot of what I read here reminds me of talk I heard among gays and lesibians 30 years ago.