Although the list for each side is exhaustive, here are some gay marriage pros and cons that were at the forefront of the question. Same-Sex Marriage: Con Arguments (those against same-sex marriage) Same-sex marriage undermines the institution of marriage that has traditionally been defined as being between a man and a woman. Marriage is a sacred union of two individuals who love each other, but this statement becomes controversial when it comes to gay marriages. This OpinionFront article discusses the pros and cons pertaining to this issue. Lesbian and gay marriages is a very controversial issue nowadays. This custom written essay sample gives some pros and cons for homosexual marriage.