But homosexual relationships are so stable.
I believe that there are studies that there is more domestic violence among lesbian couples than straight couples. But it might have been less among gay male couples.
FWIW:
Around 44% of lesbian and 61% of bisexual women have experienced forms of rape and physical violence by an intimate partner as compared to 35% of straight women.
26% of gay men and 37% of bisexual men have experienced forms of rape and physical violence by an intimate partner compared to 29% of straight men.