I looked up Limpid and it meas free of anything that darkens. so after reading the rest, i have concluded that this is talking about men prefer a women who are clear, untainted in a way. Maybe it is describing how men like the women who have been shelter and raised around a shell who will only break out of that shell around them. Because it talks about on a sheltering island, that makes me think of being shelter as kids when we are little. It could also be that because a women is shelter then she will be that to her own children and that what a man prefers. A home where the women takes care of the children.