The CHOICE to live a GAY lifestyle or REMAIN straight, as you call it,is made my every one of us as we mature. Most make this decision in their preteens and teens.
Yes there is a decision when you see that lifestyle, and you can hardly not see it today as it is all over tv and in our schools.
Good PARENTS and CHURCH make the choice easy. You can not be a CHRISTIAN, MUSLIM, OR JEW and make the choice to be GAY.
I hope that answers your questions.