Pretty sure prostitution is still older.

I even found out one of the squatters was a BackPage prostitute (one that had two children) with random men and groups of men coming in and out of the apartment.

Situations that I have stepped into that make life interesting are meth-ed hoarders, crack heads, gangs, porn production, prostitution ring, rats, raccoons, bad remodeling, half finished construction jobs, fire (but not brimstone), flood, heirs that were in prison...good grief..just a whole bunch of trouble. 

And if the bad elements know they'll be reported for vandalism, drug activity, prostitution or whatever - they'll stay away from your building.6.

Prostitutes become Nuns.  

Your tenant will never have renter's insurance, which I always require.Air BNB has become something of a problem in a lot of places, due to the constant use of the homes for parties and doing drugs and prostitutes and all sorts of other things you might also do at a hotel, except they are usually located in a quiet neighborhood causing all sorts of issues with the neighbors.

A few buddies of mine were musing about the prospect of hiring prostitutes to cause a divorce to get first leads on the property.

True, but usually has issues with trouble tenants and drugs (meth) and prostitution. 

Jimmy Reyes if you stay at the airport you'll be staying among a barrage of prostitutes.