It happened to me too one Friday afternoon. I called the lady in question for directions and she asked me could I leave it for half an hour. As I was a bit lost I agreed so it would give me time to find her place. When I called back half an hour later she asked me to wait 5 minutes outside on the steps of the house. When the door opened a guy walked out and the lady, standing behind the door, beckoned me in,with her hand appearing from behind the door. The guy nodded and I nodded back.
I was a bit wary with the hygiene issue - if she was just finished with him she wouldn't have had time to freshen up. I needn't have worried as she joined me in the shower and we were both spotless by the time we reached the bedroom. Maybe the guy before me was the warmup act or this lady is a nymphomaniac as she was all over me like a rash. We both needed another shower at the end of that session.