Separate names with a comma.
If you can morally do it, then yes. You are not hurting anyone else.
I may be a bit lost. How do you have sex if your "dong" goes off an on? A few pumps that last a few minutes does not classify as sex.
Go see a psychologist and an actual doctor. Doing this alone can make everything worse.
My girlfriend left me over this issue. It is an issue if you can have sex (penetration) with your girlfriend. As you are denying her sexual...