No one ever mentioned Surfblade from Japan, certainly low-cut straight across the waist

https://www.instagram.com/p/CI0nQmHsZ8w/

https://www.instagram.com/p/CKBvX7YsA3k/

They look very similar to Aqux:

https://tinyurl.com/mssb103e1
https://tinyurl.com/mssb103e2
https://tinyurl.com/mssb103e3

I think the Aqux is probably the nearest thing - would be nice if they did some plain ones - I'm not keen on all the multi-coloured panels. All that said, I don't think any of these are what the original photos are showing. Because I don't think guys in their 20s actively seek out such swimwear that would not be in accordance with that worn by their peers. For most younger people are more concerned with "fitting in with their peers" than they are of fullfilling personal desires. Neither would they sit at home photoshopping their photos. That's why I think other people have photoshopped them and then uploaded.

Male models in their 20's will wear what they're paid to. They are paid to do what they are told and to look good doing it. Much gay porn is performed by str8 men for the money, someone willing to do that would wear skimpy swimwear for the money.

These bikini briefs have a flat "waist" band and only a slight rise at the hip on the leg opening. The Aqux bikini briefs are also low cut but the "waist" band rises at the hips as do the leg openings. I like Aqux, I'm wearing some now, the red, orange and white "Guard" ones, but they are outside the subject parameters.

If you don't like the Aqux multicolours have a look at Seobean or Desmiit who do some more plain designs.

Ah well I'm familiar with modelling, having done fair bit of it myself over the years. But I don't think these pictures are from photoshoots - these are way more casual; the sort of stuff people quickly snap and upload to Bookface rather than carefully crafted modelling shots.

I suspect that these mini suits are derived not from a speedo design but from the precursor of the Brazillian sungas.
The breeches and trousers that evolved in Northern Europe were made of 4 panels that met in in crossed seams under the crotch. Many shorts are also 4 panel though lighter shorts may be 2 panel (left and right).
Square cut swimming trunks tend to be 4 panel, while swim briefs and bikinis can be 2, 3 or 4 panel but still with seams under the crotch.

I suspect that the Brazillian sungas evolved from a native loincloth, it consisted with a waistband of fabric with originally a loop of fabric between the legs but later reduced to a figure of 8 shaped patch sewn in front and back.
The modern sungas has evolved further into something between a speedos and a square cut.

I have a Chinese Aussibum rip off sungas made with the figure of 8 patch with 6.5" sides, I bought them when this subject came up before and they looked interesting.

The project is to use this design to make a 1.5 " low cut patched crotched sungas.

I have to disagree, I think the pictures are genuine.

There is plenty of time for young males to fit in with their peers and fulfill personal desires.

Without doubt plenty of young males are purchasing online and wearing small swimsuits in private pools but when with their peers they use the boardies.

The first shot is taken in an exercise context where basic briefs are still the norm so he is only pushing the style boundary a little.

Also the low angle of the picture makes me think it was taken from a table. Probably a timed selfie when no peers present.

Hate to say "I told you so" but I finally found proof - I found the same photo online BEFORE it was photoshopped!

Thank you, Jack Lewis. The guy in that picture is just about perfect - as is his Speedo. Can't understand why people always want to mess with perfection!

The guy appears to be enjoying himself a lot regardless if the side with of his suit!