Welcome to the Forum. There is no risk at all from the activities (notice please that I did not refer to it as an exposure) that you describe.
1- Am I under HIV or STD's risk?
No, there is no meaningful risk for any STI, including HIV from receipt of masturbation.
2- Does this worth a test? If yes, which test and when?
No, there is no need for testing.
3- Statistically, Is there anyone infected in this way?
No, there are no instances in which persons have been shown to become infected through the sorts of activities you describe.
4- Since I am married. Is it possible that I have intercourse with my wife without any test?
Yes, your massage should not keep you from having unprotected sex with your sife. There is no reason whatsoever to hesitate from having unprotected sex with your wife related to the events that you describe.
I hope that these comments are helpful to you. I have done my best to be clear in my responses. There should be no need for "but what if...." or "have you ever seen...." follow-up questions. EWH
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