Our expert says:
I can understand your concerns. Masturbation is entirely normal, but an adult chooses the time, place and circumstances far more carefully than you are describing in your husband's examples. These sound like lapses in good judgement, rather than purely sexual activites.
As usual, only a comprehensive assessment in person by an expert shrink could help you both be reasonably sure about what exactly is happening. There is some possibility that the head injury did cause some brain damage, and while many GPs are competent, assessing someone for the more subtle signs of a head injury or its consequences is not something many of them are expert in. There may have been damage to some areas of the brain directly from the accient, or from consequences of it, like a small and slow bleed within the linings of the brain. What would be best, would be for him to see a Neurologist, and providing that specialist with information about these masturbation episodes, as well as the other reasons why others in the family have said he doesn't seem normal any more ; and letting that Neurologist do a full physical exam and careful history, and perhaps perform X-rays, perhaps an EEG ( measurement of brain waves ) and/or a brain scan.
It is possible that nothing will be found to be amiss, but it's be safest to make sure of this.
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