That is NOT a stupid question. It is very valid and very good scientific question. It is something I wondered before, and I don’t think our expert friends have yet come to that answer since we need a lot more of anecdotal experience to gather every case, analyze, group and classify in order to develop that data.
I thought the same at one point. Somebody with say 12cm of BPFSL, will NOT be affected in the same way by 2kg for 20 minutes than a person with a 25cm BPFSL. There will be eventually a direct correlation of load/tension/time directly proportional to volumetric size of the phallic apparatus and/or connective tissue architecture.
Thank you! For sure there must be a correlation and it would be fundamental to know which kind of stress can be used in order to promote growth without going too far too soon, based on the same principle that excessive load can be counterproductive for our purpose, even more than insufficient.
Speaking about US heating it would be also great to understand if there any difference in time/watt used on different volumes penis in order to reach and maintain the right temp: probably Kyrpa and Manko who are very knowledgeable on US in general and moreover when applied to penis, can have an answer or a solid opinion.