Yes, you can. Silicone implants are fairly common. Also, my ex-monster-in-law was in a head-on collision 20 yrs. ago, and most of her face was crushed. She's got her lovely cheekbones again, thanks to silicone and plastic.
The "number of ribs" thing is indeed a myth. However, many women have had their lowest ribs removed, as it creates more of a curve in the waist. Cher, anyone?
Well you can always go for the index shorter than the ring trick. It's not always 100% effective as some women have shorter index fingers, but if your at all unsure in the first place check the hand and if the index is shorter get the hell outa there.
come on boys - that's a tight closet there you're in : come on out here in the light where we can all see clearly - it will be all right, I promise! REALLY! ...