There is a lot of data that suggests these are unrelated (homosexuality and CSA). I have seen no data on bisexuals. For myself, I am straight. I am currently in a non-sexual relationship, but I was married for more than 25 years and had 4 kids, the youngest is now 33.
I hope this helps. None of my CSA (5 different perps) did not include a male. My mother directed my photo session when I was 12 but the photographer was male. Although I do not remember CSA with this photographer, I do remember having under wear on my head and otherwise naked and photographed. I was about 4 at that time.