Same sex attraction isn’t a choice, but if you’re asking whether one’s sexuality can change by itself over the course of a lifetime, the answer is yes, but it’s not very common. I was straight, but sometime in my early 30s, started being attracted to women as well. I was not “always bi,” as some people claim must be the case in these circumstances. I had interrogated my sexuality quite thoroughly in an open and accepting environment years ago and found I was straight. It just…changed.