Sexual morality is not an option, but a divine imperative or command. Sexual immorality involves any and all sexual activity outside of marriage. It is any activity that stimulates sexual desire. This would include pornography, petting, fondling, and such like. One does not have to go all the way to be guilty of sexual immorality.
Sexual foreplay is inappropriate in a relationship in which intercourse is inappropriate.
The believer is to possess or have it under his control at all times. In sanctification - You can rent a room at a Holiday Inn in Washington D.C., but you cannot rent the White House. It has been sanctified or set apart for a special purpose. In honor - One should have a proper estimate of the purpose and preciousness of their body and the sexual union. Not in the unbridled passion of those who do not know God.