A dilemma faced by many young Christians today due to the confluence of current societal norms (i.e. getting married later in life) and the generally accepted Christian practice of abstaining from sex until after marriage.
Christians, as a general rule, don't start bumping uglies till the wedding night. This does present an issue for some of the more hormonal and excitable among them who just wanna get it on.
I think Bill and Mary are suffering from Horny Christian Syndrome, they are getting married tomorrow and only met four months ago.