Sheng nu cites studies that show that women are now breaking the tradition of "mandatory marriage" to have fewer children or marry later on in life. Other typologically similar terms that are still used in the modern lexicon of other countries and cultures show the concept has existed in some cases as far back as the 16th century. The term spinster was used to describe unmarried or single women of a marriageable age. It wasn't until 2004 when the Civil Partnership Act replaced the word spinster with "single" in the relationship history section of marriage certificates in the UK. Subsequently, at the
Federal Marriage Amendment proposed Amendment. The rules were passed on September 30. The resolution was immediately considered. Passage of the proposed Amendment failed 227 yea votes to 186 nay votes, where 290 yea votes (two-thirds) are required for passage of a proposed Constitutional amendment. On January 24, 2005, Senator Allard introduced the Marriage Protection Amendment, which was the 2004 version of the Federal Marriage Amendment verbatim, with 21 Republican co-sponsors. In 2006, Rep. Musgrave introduced the Marriage Protection Amendment in the House. This version had the same language as the 2004 proposal, except that the word "solely" in the first sentence was replaced