I assume that all three of your restrooms are single user home types.....no problem with anyone using them but would you want your 14 and 15 year old daughters to use the men's room, urinals and all, at the local Wal-mart???????
Actually, I was once thinking of putting one in my downstairs bathroom for guests. Just seems like a more hygienic way to handle it as otherwise, it gets all over the toilet seat and around the floor. However when I asked my plumber for a price, it was prohibitive. Not the urinal itself but the plumbing that would have to be done to hook it up. If I ever build a new house though, I'm putting one in.