My son is 15 years old and 6’6" and I can not keep bathroom floor dry and clean. Any suggestions. It may sound stupid but please be nice.
Already had to separate bathrooms for 9 year old and 15 year old so we could figure out who was making the mess. 9 year olds bathroom just has tooth paste on the walls. That’s all!?/#?
Put a bathroom rug by the shower?
Threaten to go back to toilet training days and have him “sink the Cherrioes”? with a laugh might get the point across.
I have grown sons. I asked, “who did this?” and “please clean it up.” Of course, no one did it. So I very unfairly and randomly assigned clean up till it was no longer a problem. I said, “I know, I know. You didn’t do this. I have no idea who did this, except it surely wasn’t me and I’m not cleaning it up.”
I didn’t give the kids separate bathrooms. I claimed one for me and just me. My husband got my point and shared with the “boys”
They all out-grew it.
Sounds like your 15 year old just volunteered to add bathroom cleanup duty to his list of chores.
They do outgrow it – though some need more humiliation than others! I love advice #3 – and if that didn’t work, I’d move on to advice #4. If neither works, I say, give a fair warning then block the 15 year old’s cell phone. Will work almost instantly.
Actually, in our house, DH is the worst offender, and he won’t clean the bathroom. In the guys’ bathroom, the worst part was/is all the long hair in the tub, on the sink, the floor…
DH’s parents did him no favors in the grooming/manners/cleaning-up-after-yourself departments. Trying to change his habits has been a long, fruitless slog for me. I don’t like being in that position, and he doesn’t like hearing it.
You don’t have to do anything. Though I guess you could tell him you might be wiping up after him with his bath towels and then hanging them back up to dry.
Tell him to sit?
I think the OP may be a little too subtle, but she’s talking about around the toilet.
Agree with the others; cleaning duty should do the trick.
You could install a urinal.
OP might want lower-cost options. 
Not that it would work anyway; have you seen the floor in some public mens rooms?
A neighbor of ours had a urinal in her home, and it was worse than the toilet.
Mine is 6’5 - I feel your pain. We just installed a taller toilet. We are working on this before he leaves for college next year. 
Either sit or clean up the pot! And the floor.
My first thought was sit. But I like the idea of clean up duty for him too.
I was always averse to disciplinary measures that made extra work for me.
There was something nasty on the floor. I wasn’t going to clean it up. I told someone else to clean it up. Problem is immediately solved. I can tell people to clean up all day long, without creating work for myself. It really didn’t take long for the “problem” to solve itself. During this time, I also assigned sons to do all the bathroom cleanup for the bathroom they used. For the most part, when I visit them in their homes, their own bathrooms are very clean. None have someone cleaning up for them. Those with partners still do the cleaning, as far as I can tell.
CountingDown: For the renovation to the place that will become our retirement home, I told the architect I needed my own bathroom and that’s what I have. I recommend this. My husband is pretty neat, but I am neater. He can keep his bathroom however he chooses.
I am going to feel bad about suggesting our multiple and separate bathrooms to those who don’t have that option.
@CountingDown Do you share that bathroom with your husband? If so, I guess you have two options: learn to live with his mess or make it clear to him you’re seriously considering building a private bathroom just for yourself. Go to the library and check out a bunch of remodeling books. Tell him you’re thinking of hiring an architect and that you’re on the lookout for a contractor. If he starts believing you’re serious, he may get serious about cleaning up after himself. With some men, the threat of a major expense is a great motivator.
This will be really off-topic.
I grew up with a hoarder sister, who’s become worse over the years. Because of that, I don’t waste my time trying to change someone else’s behavior with regard to cleaning up after themselves. I just change the situation so it doesn’t impact me any more than necessary. If I want something clean, I generally just clean it.
I am the mom that never made kids make their beds or clean their rooms. (I did make them clean the bathroom and kitchen behind themselves since those were common spaces. And they weren’t allowed to “spread out” in the common living spaces. They had kid living spaces for that purpose.) Recently a brother asked me during a phone conversation if I made my bed and I answered, “of course” and he was surprised. There had just been a conversation about this with his team at work and most didn’t. He told me not to dare tell his wife I now know she doesn’t make the bed. I said, “you mean that you don’t make the bed?”