What turns a person into being bi?

Having the most beautiful feminine sissy maid clean my house and all it cost me was to spank and dominate her . I say her as to me she was . Just with a lollipop . I came buckets in her and did things to her that would blow your mind . Yet when she was male . I had no interest in him .

As a child I had more or less equal numbers of friends of each gender. I didn't start looking for a relationship until a few years after I had gone through puberty. Naturally it was easier to approach people who were already friends than trying to develop a relationship with a complete stranger. So no love at first sight, I think I have a preference for the more androgynous types of either gender, I am not really attracted to people who have strong gender based attributes. No alpha males or super models, once in a relationship I am only attracted to my current partner and do not find other people of either gender attractive. So perhaps I was 100% hetero when I was in relationship with a girl and 100% gay when I was in a relationship with a boy. My hetero relationships have all been longer term than the gay ones, so perhaps I lean more towards hetero. My wife of 40 years passed away a few years ago and I am only just beginning to be attracted to other people, I haven't noticed a strong preference for either gender so far, but I can only relate to people around my own age (73), so perhaps I am still bi despite not having been in a same sex relationship for about 50 years. There are very few androgynous types in my age group, so I am not strongly attracted to any of my current circle of friends. So to address the original question I don't think anything turned me bi, that was just the way I developed, entering into an active relationship however seems to turn me from bi to either hetero or homo.

For me it was watching porn when I was younger and I loved seeing all the dicks, which turned into wanting to play with another one

My mother was bisexual, Coincidentally was involved with my girlfriend's older sister. It could be genetic but I never had same sex interest until my friend kissed me, it activated my bi gene and I liked the kiss, within a few days we were intimate