Where did sexual ethics originate from?

[Secular Elf]

why are Abrahamic religions so obsessed with sex? I was born a Muslim and i was brought up in such a way that i considered sex evil and women wearing vulgar clothes was considered extremely bad,every women who wore a jeans was considered a whore in my society though things have changed a lot now

sex before marriage has always been considered bad in the Indian sub continent among all religions

what kind of sexual ethics should we have as an Atheist?

Technically speaking, you were born an atheist, it was the Islamic culture you were born into that raised you to be a Muslim.  Congratulations on coming out of that environment.

Atheism speaks nothing about what individual sexual ethics should be.  Secular Humanism, on the other hand, gives guidelines.  From the Affirmations of Humanism written by Paul Kurtz: "We respect the right to privacy. Mature adults should be allowed to fulfill their aspirations, to express their sexual preferences, to exercise reproductive freedom, to have access to comprehensive and informed health-care, and to die with dignity.'   The full statement of principles are here:https://www.secularhumanism.org/index.php/12

In other words, you should be allowed to express your sexual orientation and desires as you wish, so long as you don't hurt anyone.  Whether it is in a committed relationship(s) or not, that is your choice to make.

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Atheism doesn't actually have anything to say on that matter - it can't help you decide that.  "Shoulds" are really beyond the purvey of atheism in and of itself - no matter what the subject.

I agree but I think my culture has its effects on my mind and thinking,the western culture feels awkward to me even though i have nothing against it maybe i am not used to living in such an environment

You may be interested in reading Ibn Warraq's (a former Muslim) book "Why I Am Not A Muslim."

http://en.wikipedia.org/wiki/Why_I_Am_Not_a_Muslim

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