Personal trainers is being really flirty part of the job is him trying to get laid?

Anonymous
I've notice the personal trainer at my gym (in his 20s) flirts with girls around his age and very friendly. He is also nice to the elder woman. So my question is.. Is it put of the job and where the line you shouldn't cross? How can you tell he is doing his job vs trying to get laid? How do you tell?
Personal trainers is being really flirty part of the job is him trying to get laid?
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