This information was originally posted as a thread by bambi_girl_wlw (Sumaya Si) on Threads. I have consolidated this thread here for easy reference for anyone that wants to use the data. Everything between the separators here is her work.

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Lesbian divorce rates are not unusually high. Reality is lesbians have the lowest rates of cheating and some of the highest relationship satisfaction. This thread debunks a widely misunderstood statistic—using real data.

The “70%” figure comes from ONS data from England and Wales, but it is often misunderstood. The data do not say that 70% of lesbian marriages end in divorce. What the ONS data actually state is that among all same-sex divorces, about 70% involved lesbian couples and 30% involved gay male couples. Importantly, the absolute number of divorces is low for both groups.

If we look further into the ONS data, the percentage of same-sex divorces involving lesbian couples was:

• 2017: 74% female couples, 26% male couples
• 2019: 72% female couples, 28% male couples
• 2021: 67.2% female couples, 32.8% male couples

From this, we can conclude that the gap has been narrowing each year.

You might still think this is high compared to gay male couples. However, lesbians are more likely to get married than gay men. In England & Wales, according to the Office for National Statistics (ONS), the female share of same-sex marriages was:

• 2014: 56.1%
• 2016: 55.7%
• 2018: 57.2%
• 2020: 57.2%
• 2022: 62.8%

This shows that the marriage rate among lesbian couples is increasing. If we look closely at 2021–2022, the share of marriages and divorces was almost the same. 

According to the 2021 Census and recent surveys (which measure individuals, not couples):
About 2.8% of men identify as gay
About 1.2% of women identify as lesbian
This means there are fewer lesbians overall, yet they make up a larger share of same-sex marriages, suggesting that a higher percentage of lesbians are getting married. 

Yes, in most countries, lesbians do have higher divorce rates than gay men. However, there are exceptions. For example, in Taiwan, gay men actually have a slightly higher divorce rate. From Taiwan MOI / GEC data, when used consistently:
65–70% of same-sex marriages are female couples
~30–35% are male couples
~60–63% of same-sex divorces are female couples
~37–40% are male couples
When these numbers are normalized, gay male couples show a slightly higher divorce rate per marriage. 

Reasons why lesbians may initiate more divorces compared to gay men 

1. Lesbians are more likely to get married A summary of LGB adults from the Williams Institute showed that: About 51% of women who identify as lesbian were married or cohabiting Only about 35% of gay men reported being in a partnered relationship In most countries, there are more gay men overall, yet lesbians make up a larger share of marriages. I reviewed multiple datasets across different countries, and most showed the same pattern. This suggests that many lesbian women getting married earlier.
2. Multiple studies suggest that gay men are more likely to be in open relationships than lesbians: In an analysis by Blumstein & Schwartz (cited in Peplau & Beals), 82% of gay male couples reported being non-monogamous, compared to 28% of lesbian couples According to Wikipedia’s summary of available data, about 33% of gay men reported being in open relationships, versus only about 5% of lesbians This suggests that gay men may be less likely to divorce due to adultery or cheating.
3. Parenting and child-related stress According to U.S. Census data (2019): 22.5% of female same-sex couple households had at least one child under 18 6.6% of male same-sex couple households had at least one child under 18 Overall, lesbians are more likely to have children than gay men, which may mean that parenting-related conflicts are less common in gay male couples. Additionally, lesbian women are more likely to experience pregnancy- and postpartum-related stress, which affect marriages.
4. Lesbians are the group least likely to cheat on their partner. According to the study “Extradyadic Sex and its Predictors in Homo- and Heterosexuals” by J. Haversath & Kröger (2014):
   4% of lesbian women
   34% of gay men
   29% of heterosexual women
   49% of heterosexual men reported extradyadic sexual contacts (aka cheating).
   This explains that lesbians are individuals who leave the relationship instead of committing adultery.
5. Lesbians are the happiest and most satisfied among all couples. This suggests that lesbians tend to leave bad relationships earlier. Studies show that lesbian’s tend to be the happiest and most satisfied among all types of couples. For example, a longitudinal study tracking lesbian, gay male, and heterosexual couples over time found that lesbian couples consistently reported the highest overall relationship quality on average across all assessments
   https://pubmed.ncbi.nlm.nih.gov/18855506/

In another Swedish follow-up study of couples after assisted reproduction, researchers found that lesbian couples reported greater relationship satisfaction and maintained stable, happy feelings—even when facing the stress of treatment.
https://link.springer.com/article/10.1186/s12905-014-0154-1

When comparing lesbians specifically to heterosexual women, research also reveals significantly higher levels of satisfaction for lesbian couples.

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Again, this information was compiled by bambi_girl_wlw (Sumaya Si) on Threads, and all credit should be extended to her.