because men have rights over women, and women have rights over men, they don't have the same rights. That's like asking why must Muslim men go to the 'll mosque but women don't have too, or why can't Muslim men wear gold, and loud clothes, but women can. See once you break the Islamic rules your community turns into America ; lesbians, adultery, illegitimate children, murder, rape, women living the man's role, man living the womans roll. Islam is perfect.
having multiple wives is not suggested in Islam, but is allowed if circumstances are there. There are always more women then men so this way every woman will be married also. And no it's not purely sexual like the west makes everything.
having 4 wives but the same luxury not being afforded to women is pure discrimination

Women should be able to marry 4 men if they please.
What's good for the goose....

