Can only speak for the frat my son joined. He enjoyed rush very much--lots of activities--dinners, outings, sports, etc. Pledging was very, very time-consuming. He is glad he joined--he was a transfer and it has helped him meet many more people. Sounds like (just my impression from listening to him talk) that girls are always welcome at the socials, other guys should be a guest of a brother. Of course, during rush all guys are welcome.