Why do we call heterosexual people straight?

The term "straight" to describe heterosexual people likely originated in the mid-20th century as a colloquial term. It suggests a direct or straightforward sexual orientation, contrasting with "gay" or "queer," which often imply a deviation from societal norms. The use of "straight" emphasizes the conventional alignment with traditional gender roles in sexual attraction. Over time, it has become widely accepted in both casual and formal contexts.