Please help me guys, is it okay if my girlfriend allows other men to touch her?

So there's her trainer friend at the gym, he’s been training my girlfriend for like almost a year now they are pretty good friends but i’ve been noticing he and my girlfriend are physically touchy like sometimes i feel like my girlfriend should set a boundary that you don’t allow other man to touch you like he jokingly touches her tights her neck i hate that, we both have talk about this but still the issue remains the same I don’t like that. What should i do?
Please help me guys, is it okay if my girlfriend allows other men to touch her?
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