Right arm longer than left - your pic - did you photoshop it ??
It is likely a form of "Fiddler Crab Syndrome" due to heavy groin-play (self or otherwise) many men get one arm noticeably larger (like a Fiddler Crabs large claw) than the other.
![](https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse1.mm.bing.net%2Fth%3Fid%3DOIP.kVIuQTkNiPzxQpOfFFUqIAHaE8%26pid%3DApi&f=1&ipt=6ccf9c2064053a399d1a7e26c9e9494d965b877d45b36b61977c0fe184885327&ipo=images)
The length is due to heavy use in "reacharound" movements which often stretches tendons, bones
and muscles.
When bhanky does "the crab" he is likely thinking of homo-erotic moments in his colorful past. His extensive use of the "Crushers of Cock" sphincter strengthening "Mananas" to perfect his turd-cutter's power over the penis is the stuff of glory-hole legend.
![](https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Fi.ytimg.com%2Fvi%2FvD18-XjXaLY%2Fmaxresdefault.jpg&f=1&nofb=1&ipt=a8f3f4808d6a193b45eaa6748d4d1da9e61539a60598cdb762269e1bc0844d13&ipo=images)