Quite a question! Homosexual behavior has been part of all human societies as far back as you can look. It has been celebrated, tolerated and banned, seen as the highest form of love and as "the love that dare not speak its name."
As far as we know, most human beings are capable of homosexual acts, even if they rarely engage in them. (This suggests to me that it functions as a form of population control.) Some people -- from six to ten percent, by most estimates -- are primarily or exclusively homosexually oriented. This percentage appears to have remained constant across time and societies.
The "problems" between society and homosexuals are caused by a vicious cycle of Ignorance, Fear and Hatred. As hatred grows, it encourages ignorance and the poison sinks deeper. Chances are, virtually everything people in America think they know about homosexuals is wrong. In recent years, however (thanks in large part to the Web!) the cycle is being broken at its weakest link -- ignorance. The more we learn about the differences among us, the stronger our society becomes.
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There is great disagreement as to the causes if alcoholism but not as to the effects of alcoholism. It can cause numerous health, legal, economic, personal and family problems.
No, people are born homosexual. Nothing "causes" homosexuality.
it effects the air we breath it also causes a hole in the atmosphere it effects our mother earth
causes problems with nervous system
Homosexuality's causes are unknown, but it is thought there are a number of causes, many of which are genetic.
Homosexuality is an odd subject. No one is 100% sure how someone comes to be homosexual, if it is a choice or something you are born with.
Drug addicts undergo numerous economic, social and health problems.
Alcoholism causes or contributes to a variety of severe social problems including homelessness, murder, suicide, injury, and violent crime. Alcohol is a contributing factor in at least 50% of all deaths from motor vehicle accidents.
It causes all different types of cancers, reprotory problems, & many other issues
See "What are the causes and effects of ozone layer depletion?"
There are no directly negative effects of homosexuality just as there are no directly negative effects of heterosexuality. However, many homosexual and bisexual people suffer persecution and/or a lack of acceptance. Bigotry towards homosexuals is believed to be the leading cause of teen suicide. Bigotry towards homosexuals also causes persecution that can result in verbal abuse, hate crimes, and/or the denial of rights and privileges afforded to heterosexuals. On the bright side, gay rights movements are gaining ground globally.