What causes a person to be homosexual?
The main answer right now is that we don’t know the precise reasons, though it is a field of study that is receiving more and more unbiased attention. Studies conducted so far point increasingly to a substantial biological basis for homosexuality, but environmental influences in early childhood may be a factor too (not the sole cause). (a) Genetic causes? There is increasing evidence that it may be partly genetic. For example, it is found that when one son is gay, his brothers have a higher chance of being homosexual too. A homosexual identical twin (who shares the same genes with his twin) has the highest likelihood of having a homosexual brother. Other articles in Yawning Bread provide more information on recent scientific discoveries. Use the search function to locate them. (b) Other biological causes? There is also increasing evidence of hormonal factors acting on the foetus. There is some tentative evidence that the brain structure in homosexual persons is different from heterosex
