However, as a young adult it is great life experience, so if he can go for cheap, why not? 

The rent is cheap enough to attract many renters and I can then select the ones I like (single ppl, preferable single female).

Maybe, he is a male prostitute and my Las Vegas homes had a few female strippers, but at least they converted their dollar bills to cashier checks and paid on-time every month.

It doesn't matter if it's coming from a male or female.

I'm going to guess you saw a video that said you could make 10x more by running an adult family home.

Quote from @Nick Zigler: Screen all adults.

female- 43 million (down 1.9 Million since 2007In poverty15% overall22% of kids under 18 (this is sad)Uninsured kids in 2011 (some interesting info in this chart)By Race-white-6.8%black-10.2%hispanic-15.1%By birthnative born-8.8%naturalized-12,5%non citizen-29.2% ( see any problem here) The interesting thing here was the future HUGE costs the U.S. is going to have with the hispanic/non citizen kids.

They charge $50 per adult so $30 should be fine. 

I have been employed steadily with a solid salary my whole adult life but took a year off and lived in africa for awhile.

I can charge about $450 per room.I plan to rent out 5 rooms to 5 Professional Adults.