LGBT Your opinion on a this little theory!?

I personally believed that all LGBT is genetics, but there was a problem with that which people always said "How can such a large percent of the population have a trait that significantly lowers there chance of reproduction" but I was reading an article recently that said that there is probably some advantage to those men who have effeminate traits or woman who have masculine traits in reproduction which basically says that bi guys and girls are why there are almost all the gay guys and girls idk just thought it was interesting and wondering about your oppinion