homosexuality

My research paper is talking about homosexual.
In the current world, homosexual become more and more general. In the early time, most countries didn’t approbate it. They thought it was diseased. But now, many countries make it legal, and so many people accepted them who were homosexual. However, there is still have many people discriminated them, treated them in different way. It showed that the conflicts between different cultures. I would like to find out why homosexual increase so fast, the people like them how to affect the culture and society.