No. To elucidate on the subject, most scientists involved in the subject believe that it either involves early environmental factors in the womb, genetics, or a combination thereof (I'm reasonably confident about the last one). If being gay/bisexual/other was a choice, you would see a notable difference in the percentage of searches for gay porn by state; instead, it is an almost entirely consistent 5%. The number of people who actually admit to being gay does, of course, vary heavily, but porn statistics don't lie. Besides, if homosexuality was a choice, you wouldn't see gay people in places like Russia or Saudi Arabia, where they're frequently murdered on the streets.
How about what straight men do in prison ??? they do other men, however, once out of prison, they seek women, not men, so perhaps that is an example of choice, nobody likes to talk about those guys, they also claim to be straight.