Can events change ones sexuality?

when i was around 9 or 10 there was a boy around the same age as me and we would hang out and stay the night at each others houses. one night i slept over at his house and he started to grab and touch my private parts.At the time i was confused about what was happing. but the more i stayed over there the more comfortable i got with it, i even started to like it. now here i am 6 years later wondering if that could have any effect on my Sexual preference ?i am a male who likes both sexes but i am mostly attracted to men, how could this event make me feel this way?