Besides, you may need the eviction attorney for both the old and new tenants.In the alternative, you can either ignore it because she is an adult, or you can threaten to evict her if her boyfriend doesn't sign a lease.

For the majority of my adult life I've been surrounded by very conservative friends and family.

I've got 7 adults and 4 children in one of my STRs. 

Now that my children are adults and I have some cash saved to start.

It's great to see younger adults getting interested in real estate and joining the forum.

Mount them up high where kids can't turn them off.Put in your owners manual that you have them and it is up to the adults to turn them on if needed. 

I think someone who is younger, or female (like it or not) might have a harder time investing in undesirable areas unless they had some muscle behind them.

Have posted on forum looking for female roomates.

If a husband/wife or whatever combination of adults want to rent from me, do BOTH need to be screened separately and both need to submit rental applications?

Did you use a rental application and do a credit/background check on each adult?