Justin Martyr (a.k.a. Justin the Martyr, Justin of Caesarea, Justin the Philosopher) (100–165) was an early Christian apologist and saint. His works represent the earliest surviving Christian apologies of notable size.
In 2001, I published a book through Trafford Publishing entitled: What the Bible "REALLY" says about... SEX: A New Look at Sexual Ethics from a Biblical Perspective. Here are a few of the key points: (1) Marriage, as we know it, was instituted after the fall as a result of the fall. (2) There are two kinds of sex: Responsible Sex and Irresponsible Sex. Sex outside of Marriage can be and usually is irresponsible, but not necessarily. (3) Alternative lifestyles, such as swinging and polyamory, can be practiced responsibly and therefore, they are not sinful per se. (3) There is sex in Heaven. In fact, there is polyamorous sex in Heaven.
These ideas have been met with great resistance in the Christian community. I still believe much, if not most, of what I believed back in 2001. But I am constantly refining my beliefs and subjecting them to rigid scrutiny. Ultimately, I believe the Bible is the final court of arbitration for all Christians. ChristiansTalkingAboutSex.com is a Christian site dedicated to seeking the truth regarding sexual ethics.