As far as I know --- and somebody correct me if I'm wrong -- in Scripture there isn't a single instance of married, man-woman sex in the procreative form which is ever condemned, nor a single instance of sex in a non-procreative form, which is ever blessed.
So why do some Biblical-minded people support contracepted sex while drawing the line at homosexual sex?
Both contracepted sex and homosex treat fertility as a discarded option, a design flaw, a bug, not a feature.
I think that once you erode (via conraception) the implicit understanding that sex is connected to fertility and that that's a good thing, heterosexuality has been corrupted and homosexuality is the obvious next step.
Does a man divorce a sterile wife because its a sin to be with her?...if so King Henry the 8 in fact had a point with the Church