Chicago Neighbors Fight Over Loud Sex In Apartment Building Via Passive-Aggressive Notes (PHOTO)

For two Chicago neighbors, the thin line between love and hate is apparently the paper-thin wall separating their apartments. 

Frustrated by the loud sex noises coming from next door, a fed-up tenant in a Boystown apartment building penned a "pipe down" missive to the neighbor -- and then slapped it on her front door. 

Instead of being shamed into silence, however, "The girl in 517" shot back with a note of her own.

Naturally, a third neighbor (and Reddit user) who lives in the Boystown apartment snapped a photo of the sex noise note squabble for all to see. 

In the first note to the noisy neighbor, the letter writer said "I'd really appreciate not having to hear every trust (sic) and moan," ending with a jab that "Luckily for me, it never lasts very long." 

In response, "The girl in 517" chided her neighbor for attempted slut-shaming and advised her to get a vibrator as good as the one Lady 517 enjoys.