8 XXX : torpedotits

Could someone explain what torpedo tits are? I am unsure. What is the difference with perky tits or puffy tits? As well, why are a lot of torpedo tits pics from 30-40 years ago? Anything to do whit the pill or something? Call to all titologists ;-)
It's got to be the bras back then right?
The pic is designed to look from the 1950s or 60s, with breasts shaped as if they were still encased in a bra from that era. An era prior to the widespread use of breast implants. And the B&W image reinforces that perception. But the shaved pussy tells a different story, that was unheard of in that era