Here's some advice from Jack on
Will and Grace:
A little background first: Both Will and Grace are interested in the same man. Will thinks the guy is gay. Grace is certain he's straight. They turn to Jack for advice. What signs should they look for that will give them the answer they seek...?
JACK: What's this? A question of sexual orientation? The doctor is in.
GRACE: Oh, Jack.
WILL: No. No, Jack has the most finely tuned gaydar in the tri-state area.
JACK: Do do do--do do do ding! [POINTS AT WILL]
WILL: He can name a gay guy in one note.
JACK: Ah, yes. Many have sought my counsel on this subject. They say, "Jack is a wise man. Jack is a dangerous man. Jack is a great man." No. Jack is just a man. A man who knows men who like men. Bring to me the facts.
WILL: Ok. In his bathroom, he had 3 magazines, and one of them was Martha Stewart's Living.
GRACE: He also had Basketball Digest.
JACK: Ahh! You both make compelling points, but I believe the truth is to be found in the third magazine.
WILL and GRACE [TOGETHER]: Vanity Fair.
JACK: Unless it's Vanity Fair.
GRACE: You're right, Will. He is good.
JACK: Now, there is one question you can ask that will reveal the truth. I hesitate to share this secret with you, for it has awesome power.
GRACE: What would that question be?
JACK: [INHALES DEEPLY] Are... You... Gay?
WILL: Thank you, Homo Wan Kenobi.
================================
If all else fails, you can try fine tuning your "gaydar..."