>>/17134/
Boobs are a secondary sexual characteristic. SSC's are "sexual" in that they help inspire arousal and indicate genetic desirability (or lack thereof) in the opposite sex. Wide shoulders and narrow waists on men are another example. We don't call women "shoulder-waist ratio fetishists".
Basically people have become so cumbrained and porn-addled that they're inverting into some kind of bizarro Victorianism where anything less than 2 cocks in every hole can be considered even vaguely "sexual". There's also no understanding of the erotic anymore, and the difference between it and porn.