Not having a wet bathing suit. Seriously, I'm totally ok with being naked. When I swim or hot tub at home, we never wear clothes so it wasn't even a thing. I hate going out in public and having to deal with a wet bathing suit. I'm a hairy gal (I remove it) and it just chafes and itches on wet skin and then I get bumps and whatnot. AN means no bumps, no itching, no rash, no wet dripping. Love it.
I know that sounds overly practical. I also love the connection to my husband and all that garbage, I promise. But my favorite-est thing is the no wet suit.