As other people have pointed out, yes, there is a cultural influence, in that there are a lot of places where you can’t say that you have any attraction to same-sex people. Iran, for instance, or portion of Africa, where simply being gay is punishable by death. In more permissive countries, you’re going to see more people admitting what the Kinsey report said >50 years ago: many/most people are not entirely, 100% straight, and the sexuality exists on a spectrum.