To me, single stall with a lock = unisex/family bathroom. And really, why can't all single stall bathrooms just be family bathrooms? Urinal, changing table, toddler seat, (ETA: the toilet proper and sink are a given). Bam. I get cost and coding, just my little "if I had a magic wand" thing. I don't do super smelly/dirty/buggy bathrooms, though. I will go somewhere else. On a camping trip, this has meant the woods (ironically).
And in defense of the guys, here's a short poem:
No matter how you shake and dance,
the last two drops go in your pants.
You're welcome. ;)