THE ULTIMATE ANSWER TO WHETHER OR NOT BREASTS ARE SEXUAL ORGANS
Do they produce haploid gametes (either sperm or ovum) that can fuse to ultimately form an embryo? No.
Do they transport gametes? No.
Do they house the fetus during pregnancy? No.
Are they involved in the reproductive system of mammals? No.
Well what do you know, looks like they aren’t fucking sexual organs.
I know that a few of you might need to read this, just for clarification.