When I approached the group's I'd chat up the noseguard. As much as women pretend to not have a pecking order, they are well aware who is hottest , and the hotter ones will chime in to get your attention, giving you the opportunity to joke a bit with them. Then you can usually move to get her alone from there The more " alpha(the hot ones)" nullify that girl rhemselves this way. In turn that big girl will feel like she's pissing her friend off if she trys to take her away.