Generally vagina size is mostly incels getting it wrong, but since there is lots of body dismorphia with breast size as well as people who they may be trying to attract having sometimes openly stated preferences in it, I’d say chest or ass size which can be similar is more likely.

Not that cars would be the compensation. Oh, how the face looks too, as I’ve definitely seen people accuse women of dressing “slutty” because they’re a “butterface.”