You don't wait 6 months to get married and there is no gigantic engagement party.
Sexual relationships, or any physical relationship between a man and woman for that matter, is not the initial experience because any physical act requires a spiritual attachment.
Just like the government only gets involved with married individuals (a man/woman can sleep around all they want without responsibility), God's relationship laws are only for those with the maturity and intellect to legally commit.
For a detailed description of what points 1-3 are talking about read: What Muslim Women Look For In A Husband.
Remember the ultimate Muslim belief: there is One True God Who creates love and unites people.
His laws on interaction and dignity are priority throughout. There is no engagement in Islamic law, as understood by popular culture.