Co-habitation generally refers to the scenario in which a heterosexual couple choose to live together in a romantic relationship while choosing to remain unmarried. According to Rouse (11), there are generally four types of cohabitation and these include convenient cohabitation, trial marriage, temporary alternative to marriage and permanent alternative to marriage. A permanent alternative to marriage type of co-habitation occurs among people to whom there is no prospect of marrying. It’s common for individuals who are not legally permitted to marry, and this may include gay couples or two consenting individuals living together in an incestuous relationship. Because the option to marry is not possible in this kind of relationship, couples resort to and view this form of long-term cohabitation as a necessary union in the absence of a legally binding marriage.