There is no scientific basis for gaydar at all.

Question

Quizplus · Accepted Answer

While the concept of "gaydar" (the purported ability to determine if someone is gay based on intuition or observation) is controversial and not scientifically reliable, some studies suggest that people can sometimes guess others' sexual orientation more accurately than chance. However, these findings are limited and do not support the idea of a highly accurate or reliable "gaydar." The concept is criticized for reinforcing stereotypes and not having a solid scientific foundation.

There Is No Scientific Basis for Gaydar at All