Or another option is what we are doing. We have an existing half bath on an exterior wall leading into our backyard with a window. We are removing the window and adding a door. So swimmers will have direct access to a bathroom without going through the house. And we still have the same number of bathrooms to maintain. Of course this option won't be available to many, but might could with a few.
Now that's a GREAT idea! We just re-did our exterior doors with AWESOME fiberglass doors. We replaced some really bad wood doors that were basically warped and letting in every critter under the sun not to mention letting out all our AC.
Since the door will be exterior, make sure they do a good job framing and sealing it. Also, where we are, doors can be made with "pool code" locks - essentially deadbolts set up around 30" from the top of the door so little ones can't get out. My entire house is set with pool code DBs and now my 2 yr old can't open any doors once I lock them.
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