I completely (and respectfully) disagree with you. In your earlier response you stated "Actually, we are not allowed by law to discuss such matters as: race, nationality, religion, sexual orientation, age, etc. when discussing Real Estate." We, as agents, are not allowed to DISCRIMINATE based on the aforementioned characteristics. My understanding of our moral and ethical professional responsibilities does not lead me to think I cannot discuss these things in an open forum. Discussion leads to education and education to prevention. Most importantly, answers like Tricia's (or the first post which was deleted), directly provide information that are helpful (not to mention lawful) to the original question.
Maybe I am way off base here, but I personally do not equate someone's request for a Realtor with a certain characteristic (whether that be male/female, heterosexual/homosexual, young/old) to be a problem. Buyers and sellers should have the right to work with whomever they choose or feel more comfortable with.