To have a girlfriend before marriage is really stupid.

For men to keep girlfriends before marriage is so stupid (of course, that they do it under pressures, most of them, is another matter).

When they have to get bound with a woman for all his life, ruining his freedom, then why give up your freedom earlier? Youth is the time to enjoy your freedom and do your thing, not to take up the responsibility of a girl.

And, of course, it is an oppression of straight men that they are forced by the society to do this. When you're a member of a community or social order, you have to do the needful -- that is the things that the community requires for membership. And if men have to be in the straight space (and not be thrown into the gay space) they too must do the needful and constantly prove their sexual interest in girls, whioh is only possible by keeping a girl with you all the time.