Is this true or am I just noticing it as an adult now? 

I do credit and background check and advertise that this is a cost they incur (to be fair, I tell them there is no fee to apply and after we have reviewed the application and decided to move forward only then will they incur the credit/background check fee of $35 per adult)  The service I use is mysmartmove.com becuase I never have to see the SSN or CC number, all I do is put in their email address and the website does the rest.  

My two other jobs currently are as a door to door salesman for a renewable energy project and as an event organizer for a community of young adults.

The lease I inherited indicated there was only one female tenant.

As a young female, I'm reluctant to go to the property alone, if that says anything.I hope this small tidbit of knowledge helps!

Males had a median income of $28,420 versus $20,967 for females.

Failure to do so can put you in a bad situation if you just turn over keys to his "sister", especially if he has more than one sister, or perhaps adult children, and they are not all on good terms.

Every adult should be required to pass your screening first, then be added to the lease.

Then I asked my kid to turn the snake over , I tell him its only a female .  

As a child, the trips up and down were just child's play :)As an adult, I still get around fine, but would grow tired of going up and down stairs regularly to do laundry.