I'll be honest I'm not sure if this is the correct place (Please feel free to send me to a similar place for advice) but I have this situation I always wonder if people have found a good way to handle.

Essentially the concept of discouraging a girl from coming over to visit you unannounced without raising suspicion.

Also, how to handle being at home with a girl when a girl comes over and knocks.

I have a garage so after a knock or 2 the person will leave. Not know I'm home. The concern is the girl who's already over.

I can handle not bothering to go even check by pretending it's a neighbor, or a crazy ex? The crazy ex angle doesn't come across very well though.

Anyone figured a way around this problem?