Some Definition MOC :)

A marriage of convenience (plural marriages of convenience) is a marriage contracted for reasons other than the reasons of relationship, family, or love. Instead, such a marriage is orchestrated for personal gain or some other sort of strategic purpose, such as political marriage. The phrase is a calque of French: mariage de convenance - a marriage of convention, or marriage of suitability. In the cases when it represents a fraud, it is called sham marriage.(http://en.wikipedia.org/wiki/Marriage_of_convenience,2012)

A lavender marriage is a type of male-female marriage of convenience in which the couple are not both heterosexual and conceal the homosexual or bisexual orientation of one or both spouses. In gay slang, the spouse whose presence conceals the other's sexual orientation is referred to as a "beard". (http://en.wikipedia.org/wiki/Lavender_marriage, 2012)