I've always wondered how do male anime characters figure out a girls BWH measurements? Do they have protagonist magic or something like that? Because I'm trying to make a character like this for fun but I don't know how the logic works, I'm not trying to sound creepy or anything. I've seen this logic applied in PG anime before so if need be I'm asking for a PG answer as well but if possible the fan service logic would help as well. I'd also like to know if this logic can be applied IRL and if so how but this last question doesn't necessarily need to be answered. If this question isn't suitable for this website please let me know how to make it suitable because I don't wish to offend anyone. Please and thank you in advance.

The discussion of things pertaining to bust size isn't something that would really work here, so I'll be closing this thread. I'll do my best to give you some sort of answer, though.

I don't know what this has to do with cartoons, anime, or manga.. it's so specific that I don't think it does, actually.

I'm going to give you some advice. I'd recommend not getting too lost in anime, none of it actually applies to reality.. I also don't think there's any room for theories on how they discover these measurements. If there had to be some way that somebody figured out a girl's measurements, they would probably either measure her, or have stalked her enough to find this out.

I wouldn't recommend discussing body features of anime character in this forum, it.. disrupts some of the flow. Mind you this forum is also intended for cartoons, which usually are designed towards kids and would draw them in.