Which is what, pappa Clark?
#1: The family court system.
#2: Unlimited porn at no cost.
I think you are wrong. There would be no need for the family court system if everyone who got married, stayed married. The family court system, in other words, is the result of the "Hookup Culture", not the cause.
As to #2, technology has indeed made it available at no cost, but the problem began long before the technology existed.
Both of the factors you cite are making matters worse, but they are not causes; rather, they are effects. I think humanity got on the slippery slope it is on now back in the '60s during the hippie era of "free love." There is no such thing. If it's free, it's not love and if it's love, it's not free.
