There is no atheist position on this and many issues. Atheism only is the position that there is no god or supernatural powers. As far as sexuality, atheists may be celibate, promiscuous, monogamous, polygamous, professional or any other sexually related position. Atheism has no comment or control on a person's private life.
This does not really have to do with extentialism, But we atheists view sexuality as a healthy part of an adult's life.
Atheism is NOT A RELIGION. It has no rules. Those are given by morality. Every atheist has different opinions.
Sexuality exists, just like new, fun big words!
That is not a question. Atheists view friends as friends.
There are no categorically atheistic views on any topic except a general lack of belief in gods. Apart from that atheists are simply people. They do not all think alike and with one mind such as theists. You have confused atheists with theists who generally hold religious beliefs as a group.
Suffering and dying exist. Existentialism has no part in atheism.
There is no impact. If people don't like people of a different sexuality, it's because that's just how they think, not because they're atheist. There isn't an atheist book about what you should think about heteros/homos/trannys etc.
We believe in life, and that life does exist.
Ownership is a concept. Money is just thin peices of paper that make someone better then others, when in nature they are not.
To an atheist, all true knowledge is secular or atheistic in nature. When I studied religion and theology, I did it from a secular standpoint. To truly learn something one must first remove emotion from it. The rest comes easy.
Catholics view sexuality as a gift from God meant to be expressed within the bounds of marriage. They believe in the sanctity of marriage and that sexual intimacy should be a loving and unitive act between a husband and wife. Catholics also emphasize the importance of chastity, modesty, and respect for oneself and others in matters of sexuality.
Homosexuality is found in over 450 species. Homophobia is only found in one.