<human>: Could you distill the essence of the text into 1-3 sentences?

So I have been dating a girl for 5 months now. She seems to really care about me and we aren't having any major relationship problems but when she tells me about her days at work she mentions her flirty relationships with co-workers and friends. 

Yesterday my friends invited us to a nice restaurant to catch up and she sees a co-worker at the restaurant and calls him over. He talks to her briefly all the while I have no idea who this guy is and she never introduces me. Not as her boyfriend. 

Not even mentioning my name. After her co-worker walks away she explains who he is and that she grabs his ass at work and even goes on to mention she took his phone when he wasn't looking and took several selfies "just her face".. and when he noticed the next day he told her he "masturbated" to the pics.. all in a joking manner. 

All of my friends at the table could hear her (all couples) and the table went dead silent for several minutes. This is just one of several guys she flirts with in this manner and some are gay and that doesn't really bother me but should I be concerned ?

 We have talked about it before and I mentioned I wasn't comfortable with her sexual behavior towards other guys. This was due to her telling me she offered to flash some guys at work if they would help her with a table(she is a server).
<bot>: my gf talks to other guys sexually and even touches them inappropriately in a "joking way" and it bothers me.