to elaborate a bit on the idea, I'll make a few claims:
if regeneration is a positive feedback loop than
degeneration is a negative feedback loop.

why does this apply to "sleeping around?"
it causes individuals to become desensitized to the aforementioned spiritual aspect of sexual relationships 
it causes many to remain in toxic relationships, casual or formal, much longer than they might otherwise
it increases biohazard risk in a population
it can cause a lot of unwanted pregnancy and the issues that arise from that, single parents, unhealthy parental lifestyles, unnecessary debt, etc.
sexual expectations may not align with reality after having slept around when a young person finally settles down with a spouse, causing marital tensions in some cases

of course life is messy and doesn't follow all of these claims in every situation, but society wide I think that it is fair to say it degenerates society to some degree for these above reasons.

all that being said, as a young man, largely lonely I would've rolled my eyes at my above comment, but post marriage and children, I recognize that there is more to this than simply "God says"