• “Very few women have completely symmetrical breasts and it is common for one breast to be slightly larger than the other.” - Women’s Health Concern  
• “Very few women have perfectly symmetrical breasts. A slight difference in size — up to 20 percent — between the right and left breast is normal. Sudden changes are not, though, and are reason to talk to your doctor.” - EveryDayHealth  
• “If you have asymmetrical breasts, you’re not alone—this is incredibly common, women’s health expert Jennifer Wider, M.D., tells SELF. “It is actually more common for women to have different breast shape and size than absolutely symmetrical breasts,” Nazanin Khakpour, M.D., F.A.C.S., a surgical oncologist specializing in breast cancer at Moffitt Cancer Center, tells SELF. “They are sisters, not twins.” - Self.com
   
  @Beau Skunky  

Yeah, that’s like saying everybody of either gender has one arm/leg longer then the other, or something.

• “Don’t be alarmed if one testicle seems slightly larger than the other, that’s normal. It is also normal that one testicle will hang lower than the other.” - TesticularCancerSociety, Young Men’s Health and Healthline

@Beau Skunky
That’s a thing all women have, though. I mean apart from those who get surgery.