None of this applies to me. I'm old and married. I don't have any daughters who'd think "Hey, I can get paid for this?"
But, as a young, single man with no desire to procreate, legalized prostitution would have made me a lot less interested in the dating process. The dinner, drinks, movies, conversation, etc, etc, would have cost a lot more with no guarantee of a happy ending. That would have been replaced with "Here's your $50. Turn around and bend over. I'm meeting some buddies in a couple of hours." And, once accustomed to that, there would be no need for marriage later. We'd be a country of single dudes, hanging with the boys between visits to the sex shop. And women would have to adapt and throw it out a lot quicker if they ever wanted to get married.