Looking for somewhere to live with your many spouses in the group marriage of the future? No need to move to the Moon. Why not settle down in digs built by science fiction author Robert Heinlein?:
Historic home built by noted science fiction author Robert Heinlein sits on a quiet 1.5 acre lot within walking distance of the Broadmoor Hotel & Cheyenne Canon. Main level with parquet wood flooring throughout features a large formal living room w/moss rock fireplace and walnut wainscoting, spacious dining room, galley kitchen with breakfast nook and walkout to 10x35 patio overlooking the private wooded lot w/three cascading ponds!
At 4456 square feet with four bedrooms, that's room enough for a few spouses (or perhaps the plural is spice?).
The price? A mere $650,000.