A thumb ring is often warn as a sign of power. Traditionally it was worn by archers to protect their thumb during rapid firing. Although often misunderstood as a statement of sexuality, the thumb ring symbolizes strength and courage.

A swimmer

If a woman wears a thumb ring on her right thumb, she is considered to be Bisexual or Lesbian

Worn by men and women . For fashionable purposes.

A thumb ring signifies that the wearer is a gay man or women.
It's how us flaming homosexuals find each other

The most heterosexual digit on which to wear a ring.

When a ring is worn on your thumb it advertises your willingness to engage in anal sex. Like white pants it transcends the boundaries of gender and sexual orientation.