I’m glad you mentioned reasonable levels because like with anything, it can be harmful if done too often.
Great question.
Essentially if its not interfering with your life in a meaningful way, you’re fine.
If it causes you to miss work or if you’re unable to wait until you get home and end up doing it somewhere its not acceptable, then its an issue.
Or not being able to stop or reduce the frequency can also mean its an issue.
However, rather than listen to some nobody in the internet, you’d want to consult a medical professional.
If it causes you to miss work or if you’re unable to wait until you get home and end up doing it somewhere its not acceptable, then its an issue.
I remember a story about some low level politician pulling off into the parking lot of a preschool to rub one out. That probably would be a good example of this.
Is there an actual specific reasonable interval or does it vary person to person (of course putting aside any specific issues like muscle injury in the area for an example)
It does vary from person to person. Whats reasonable for you may not be reasonable for others. Libido as well as age is gonna be a factor. Some people do it multiple times a day and others are a couple times a week.
Again as long as its not hurting you or others, go for it man. Like others in this thread mentioned, in moderation, its a healthy thing to do.