starting the lawn mower, a lot, does a bit to incur shrinkage
This is actually the opposite. Penises very much follow a "use it or lose it" rule. Every single trans woman is informed that even if sexual interest collapses during hormone therapy they must keep using the penis prior to surgery or else. This is important because more to work with is better for surgery outcomes.
I've read that it could be caused by EXCESSIVE masturbation (which my gooner brain is happy to oblige), but you could be right and it's been other factors, issues, and simply aging.
This is actually the opposite. Penises very much follow a "use it or lose it" rule. Every single trans woman is informed that even if sexual interest collapses during hormone therapy they must keep using the penis prior to surgery or else. This is important because more to work with is better for surgery outcomes.
I've read that it could be caused by EXCESSIVE masturbation (which my gooner brain is happy to oblige), but you could be right and it's been other factors, issues, and simply aging.