Yeah, this is actually a pretty valid question.
For one...it's none of the girls BUSINESS to know about any of this unless you two are exclusive. The only thing I'd refrain absolutely from telling a girl is that you go sarging. You want the impression women just naturally want you. Not that you hunt for booty in your free time.
Normally, a girl would only expect an attractive man to be in the mix with multiple women. It's her job to work to make you two exclusive, not yours. Because you have options, who is she compared to the others?
Dont feel ashamed for seeing multiple women if you have no verbal agreement with a woman to go steady. Infact, it's perfectly natural. It's called being a man.
The disney bullshit in society about only being with one girl and living happily ever after with rainbows and unicorns can go fuck itself. It wont happen. By getting numbers and seeing girls, your naturally selected with women, in turn making you more attracted to them. Women ALWAYS WANT WHAT ISNT THEIRS
But...dont tell her you sarge.
Edit: Well, by your actions I think it should display that you're not looking for anything serious. If you just want sex with a woman, it can either happen right away or can take a long time to wear her down to the idea of just having casual sex. There's obvious behavior patterns between someone that wants a relationship and one that wants sex. Be sexy and funny and kind, but dont be clingy, get weird on her and try to connect on that "deeper" level like lovers do. Let her know you're interested but dont rush it.
Good luck my man
