https://www.medicalnewstoday.com/articles/321153.php
Does masturbation cause hair loss?
There are no studies connecting hair loss to masturbation.
In a word, no — there is no scientific evidence that masturbating causes hair loss. a study from 2001 showed that adult males actually had an increase in testosterone levels after abstaining from masturbation for 3 weeks. This means that testosterone levels might actually rise if a person avoids ejaculating.