I started this thread in order to give a balanced position regarding the “holiness” and “unholiness” of sex. I also wanted to defend the position of why Christ could not be married which was brought up in another thread (“Fascinating Inter-Protestant Discussion regarding Bible origins”), but was subsequently deleted because of its controversy.
After some reflection on the subject of sex, I have the following thoughts:
Obviously, sex in and of itself is neither good or evil, holy or unholy. Just like the conversation between two people, holiness is determined by whether one is a believer. Unholy conversation and unholy sex exists between people who have rejected the spirit of Christ. The charity of Christ sanctifies all things. Therefore “pure” charity makes “pure” sex holy (not the other way around).
The peculiar vulnerability of a believer to carnality in sex is probably because the sin body has not been entirely destroyed, i.e. they are a weak Christian (or none at all). Yet, growth in Christ (i.e. destruction of the sin body - Romans 6:6, 8:13, 12:2, Ephesians 4:22-24) and the continual cleansing and renewal from sin (2 Cor 4:16) requires the recognition of the truth (James 5:16, 1 John 1:9).
Old testament allusions should be seen in light of the new testament. The old testament is a shadow of the full revelation found in the new testament, and of itself bears no fruit (2 Cor 3:7-11, Mat 21:19, Luke 13:6-9). In order to bear fruit, we must see the Song of Solomon, for instance, as depicting the spiritual love between Christ and his church, not physical love. Through eternity, the light of Christ will penetrate the virginity of all believers perpetually, and their will be no place for “physical relations” (Daniel 12:2-3, Matt 22:30, Mark 12:25, Luke 20:34-35).
In Christians who have destroyed the organization of their sin body, the flesh (and pride) of our old man, in an unorganized state, still fights against the Spirit of Christ (of whom our “new man” is made). 1 John 1:8, Romans 7:25, 1 Cor 9:27, Galations 5:17. The gradual corruption and death of our physical body symbolizes our imperfect state (which will be perfect when we are raised from death - 1 John 3:2-3). In regard to the original question, Christ while on the earth could not have been one flesh with another flesh, i.e. be married, that has sin (which must be continually purified by the one perfect flesh and spirit of Christ). Christ’s flesh has always been the flesh of the spotless lamb of God. This proof is in addition to the fact that Christ was single in pleasing the father and already betrothed to one spiritual wife.