I think like I'm assuming Joe is, the faithful marriage is something to be encouraged and there are problems with promiscuity.

That is in no way to say there may not be reason for contraception or to say that I personally agree with the RC stance on a priest being celibate.

As an attempted but failed believer, by current belief is whether you marry should be between you, your partner and God.

The one reservation I would have is (and my only ever sex I had was with a non Christian and it wound up one hell of a mess with her and bf in prison) is that those with this particular belief should seek others with the same belief.