Two able-bodied adults who make life choices that result in eviction, but the landlord should feel sorry for them? 

The issue with RUBS is that it is fluid and it hinges on the # of occupants and this poses issues: 1) A child uses less than an adult; 2) a worker from home uses more than one that drives to work; 3) A couple may have a child during tenancy which they fail to divulge; 4) friends and family may visit for a few days during holidays.... etc. etc. etc.  --- and... these issues become issues for the other Tenant and then turns you into the constant 'utility police' because you constantly have to monitor # of occupants... eww. 50/50 is simple and simply understood and 100% while vacant is also simply understood.

All I need is a full name and email for each adult.

You shouldn't be talking about leaving your first real job as an adult already, that's a Lamborghini hope with a Yugo foundation.

Little kids or bad adults are more likely to cause problems.

Everyone is an adult.

Female tenant moves in. 

Great news, and I'll know more next week, but I just spent the entire day yesterday going over hours and hours of audio recordings I had from a prior closing, many phone calls and conversations etc even additional very HIGHLY incriminating evidence that I GUARANTEE this Pastor and County Chaplain DOES NOT want getting out to the public and we're going to see if we can finally get this outstanding MAN OF GOD to be an adult and accept the inevitable before it gets worse for us both if they further delay.

I've posted that I prefer female housemates (zillow, hotpads, and roomies allow for this) so I assume I can deny someone for being male if that's not what I want and clearly state this in my reply to them?

Every adult residing in your rentals should be screened and approved by you.Criminal history is not an automatic denial, but you should definitely consider risk.