Help! My boyfriend wets the bed!

OK my man is 22 years old and in awesome shape, not sick ever, and wets the bed. In out almost 3 years of sleeping over at each others house he has wet MY bed 6 times! I'm not sure if he does in his or not though. Its sporadic and it seems not to have reasons. He has tried not drinking certain things, not drinking after a certain time and making sure to go pee before bed and nothing seems to work. I keep telling him to go to the doctor but he wont. Any advice would be appreciated!
Help! My boyfriend wets the bed!
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