EFFORTS TO SOLVE THE RIDDLE OF HUMAN SEXUALITY advanced in still another direction last week. For years, controversy has raged in scientific circles and in the gay community over whether homosexuality should be considered the result of biological or environmental factors. In 1993 the debate grew fiercer after researchers announced a study linking some male homosexuality to genes inherited from the mother. Now the same team has come up with evidence that bolsters its earlier findings and supports the theory that "gay genes" may predispose some men to seek partners of the same sex.

In the new study, scientists analyzed DNA...

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