Eph 5:3 But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints;
Eph 5:4 Neither filthiness, nor foolish talking, nor jesting, which are not convenient: but rather giving of thanks.
Eph 5:5 For this ye know, that no whoremonger, nor unclean person, nor covetous man, who is an idolater, hath any inheritance in the kingdom of Christ and of God.
Eph 5:6 Let no man deceive you with vain words: for because of these things cometh the wrath of God upon the children of disobedience.
Eph 5:7 Be not ye therefore partakers with them.
Joseph Herrin at Parablesblog has some interesting posts concerning marriage etc:
The Marriage Covenant - Introduction
The Marriage Covenant - The First Foundation
Foundation Two - The Body as a Temple
Even Coach Daubenmire has a post today on a similar topic
SPIRITUALLY TRANSMITTED DISEASES
Repent of fornication. Our society is saturated with it, which is why God instructs us to come out from among them and be ye seperate.