Wiktionary
n. (context humorous English) A phrase, often satirical, recasting the Biblical couple of Adam and Eve as a homosexual couple, Adam and Steve. In context, it may be used as a pejorative against either homosexuality or religious opposition to it.
Wikipedia
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"Adam and Steve" is a phrase that originated from a conservative Christian slogan "God made Adam and Eve, not Adam and Steve", intended to concisely summarize Judeo-Christian Bible-based arguments against gay sexual practices or homosexuality. Among other things, it implies that the natural way of life for humanity is illustrated by the Biblical account of the creation of human beings as a male-female pair.
Usage examples of "adam and steve".
By the time Adam and Kane arrived, and I got everyone calmed down enough to go to bed-Adam and Steve armed with a small pistol that I didn't even know Steve owned-it was almost 1 AM.
I thought about Adam and Steve's situation as I drove, and eventually my thoughts drifted to my own situation with Micah.
When God created the first family in that Garden, he created Adam and Eve, not Adam and Steve, 'Besides, I want influence, not power.