[TrevorG]

I don't know about the specific chapter you are thinking of joining, but a good Fraternity will be very accommodating for guys with girlfriends. A "closed social" would basically just be your chapter spending time with a sorority, you don't really bring "dates". It is possible that your girlfriend may be allowed to attend, but honestly if she doesn't trust you to hang out with other girls for a few hours and not cheat on her then you probably have more serious problems.

I've never heard of an official brotherhood retreat to a strip club. It sounds super tacky, but I suppose its not impossible. The chapter wouldn't attempt to force you to attend something like this if it actually happened. Strip clubs are only fun when you go with more girls then guys anyways.

I would suggest that you join an organization that already has a high number of brothers in relationships, or has a positive reputation for being gentlemen amongst the girls at your school.