Given that all of the women I have been regularly intimate with have liked it somewhat rough, I found the phrase "beating on each other" suitable, though at least the vast majority of "beating" has always been done with genitals.
Beyond this sleek veneer
Beneath the neon existence
Her face is grey
And everything she longs for turns to black
The chemicals bring little vindication
And white lines lace every vein
Does she realize what she's become?