How come in some schools frats dont let guys into parties?

[rock5060]

It depends on the chapters. At my school, fraternities host parties for freshmen the first week. Males and females are all welcome. When it get later into the fall semester, most invite people only for crowd control purposes. If you show up at the house without a wristband, they'll allow you in. If you bring girls, they have to allow you in because these ladies may not know anyone in the fraternity, feel insecure, and leave after 10 minutes.