Lyric discussion by theonlybuster 

The song's about anal sex.
"Looking in your big brown eye", brown eye is slang but butt-hole.

Anal sex isn't a quick slide in kind of thing, hence the "push it push it some more". The crying is obviously because it hurts, but he doesn't say a thing about her trying to escape, running away, or fighting it, she's simply in pain, thus it's likely NOT about rape. But simply a couple having anal sex.
The sweating, well it's common to sweat during sex. It's also common to sweat when your body is under strain.

Was that so hard boys and girls?

On a side note, I can't help but laugh when I see girls running to the dance floor when this song comes on.

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