[Alfonso]

Thanks a lot, Rusty, for both, your corrections and confirmation. I hope it's already clear the meaning of no hay moros en la costa. As you can imagine, this saying dates back to ancient times, when Spanish coasts were devastated by Muslim pirates. Nowadays it's used quite often here in Spain and it hasn't got any racist connotation, although it's better not to say it to a Muslim if he's young and strong.
I'm kidding!