[stinos]

Could be, but that's just one option. Another one being: purely curiousity. Engineering (and other) minds often think in ways like "What does it look like? How does it work practically?" etc, and that goes for any subject, so if that happens to be gay sex then gay porn would surely be a good starting point (while keeping in mind that the depicted stuff might not exactly represent reality, like a ton of porn out there).

[rocqua]

Indeed, it is possible to enjoy gay porn without wanting to have gay sex. There is weird stigma around this though, which is why I suggested introspection. The stigma might distort some self-perception.

It is hard to talk about this because sadly 'you might be gay' is often read as an accusation.