Let’s look at this post from The Public Discourse and see if gay relationships are as stable, or even more stable, than straight ones.

Excerpt:

The [NFSS] study found that the children who were raised by a gay or lesbian parent as little as 15 years ago were usually conceived within a heterosexual marriage, which then underwent divorce or separation, leaving the child with a single parent. That parent then had at least one same-sex romantic relationship, sometimes outside of the child’s home, sometimes within it. To be more specific, among the respondents who said their mother had a same-sex romantic relationship, a minority, 23%, said they had spent at least three years living in the same household with both their mother and her romantic partner. Only 2 out of the 15,000 screened spent a span of 18 years with the same two mothers. Among those who said their father had had a same-sex relationship, 1.1% of children reported spending at least three years together with both men.

This strongly suggests that the parents’ same-sex relationships were often short-lived, a finding consistent with the broader research on elevated levels of instability among same-sex romantic partners. For example, a recent 2012 study of same-sex couples in Great Britain finds that gay and lesbian cohabiting couples are more likely to separate than heterosexual couples.^[3] A 2006 study of same sex marriages in Norway and Sweden found that “divorce risk levels are considerably higher in same-sex marriages”^[4] such that Swedish lesbian couples are more than three times as likely to divorce as heterosexual couples, and Swedish gay couples are 1.35 times more likely to divorce (net of controls). Timothy Biblarz and Judith Stacey, two of the most outspoken advocates for same-sex marriage in the U.S. academy, acknowledge that there is more instability among lesbian parents.^[5]

This paper from the Family Research Council makes the same point:

The 2003-2004 Gay/Lesbian Consumer Online Census surveyed the lifestyles of 7,862 homosexuals. Of those involved in a “current relationship,” only 15 percent describe their current relationship as having lasted twelve years or longer, with five percent lasting more than twenty years.[4] While this “snapshot in time” is not an absolute predictor of the length of homosexual relationships, it does indicate that few homosexual relationships achieve the longevity common in marriages.

In The Sexual Organization of the City, University of Chicago sociologist Edward Laumann argues that “typical gay city inhabitants spend most of their adult lives in ‘transactional’ relationships, or short-term commitments of less than six months.”[5]

A study of homosexual men in the Netherlands published in the journal AIDS found that the “duration of steady partnerships” was 1.5 years.[6]

In his study of male homosexuality in Western Sexuality: Practice and Precept in Past and Present Times, Pollak found that “few homosexual relationships last longer than two years, with many men reporting hundreds of lifetime partners.”[7]

In Male and Female Homosexuality, Saghir and Robins found that the average male homosexual live-in relationship lasts between two and three years.[8]

It’s a Grindr lifestyle. And it’s not a good environment for meeting the needs of children. (Example)

There is one study (Rosenfeld, 2014) that tries to argue against the conclusion of all these other studies, and the problems with it are discussed in this post.

The right way to think about gay marriage is to think about it as an extension of no-fault divorce. The same feminists and leftists who pushed for the legalization of no-fault divorce told us back then that the children would be fine, that children are resilient. No-fault divorce was a change in the definition of marriage. The leftists said that divorce would never become widespread, and that it would not harm children in any way. It was all a pack of lies. If the practices of the gay lifestyle become conflated with marriage, then marriage will come to denote relationships engaged in for “love” not children, such that unchastity, infidelity, increased domestic violence and frequent break-ups are incorporated back into the definition of marriage. Marriage is about permanence, exclusivity and building an environment that can welcome children and supply for their needs. It’s not about government giving people respect for their romantic feelings. Those are volatile. What government ought to be rewarding is lifelong commitment.