True on any given night; but it might well be the case that the unattached men are always the same ones, whereas each woman is unattached on certain nights but not on others. ETA: e.g., on Monday, Albert sleeps with Alice while Bob, Charles, Betty and Cathy stay unattached; on Tuesday, Albert sleeps with Betty while Alice, Bob, Charles and Cathy stay unattached; on Wednesday, Albert sleeps with Cathy while Alice, Bob, Betty and Charles stay unattached.
True on any given night; but it might well be the case that the unattached men are always the same ones, whereas each woman is unattached on certain nights but not on others. ETA: e.g., on Monday, Albert sleeps with Alice while Bob, Charles, Betty and Cathy stay unattached; on Tuesday, Albert sleeps with Betty while Alice, Bob, Charles and Cathy stay unattached; on Wednesday, Albert sleeps with Cathy while Alice, Bob, Betty and Charles stay unattached.