My ex is bi, and after we split she had several failed relationship attempts with men who she threw herself at (one night stands that she tried to declare were relationships).
Then she got together with a woman, and they married 6 weeks after first meeting (I think that's pretty quick, considering you have to give 28 days notice beforehand). Ex told our kids (5 and 7 at the time) they were getting married, but didn't say when, and told the kids to keep it a secret. Then she proceeded to turn up at school pickup in her wedding dress afterwards. Social worker described their relationship as a 'toxic co dependency', and it went downhill from there.
They split up after 2 years (I was surprised they lasted that long). Then after a while my ex met another woman, and moved at lightning pace all over again (first introduced the kids when new woman was there staying for the weekend). Within a month my ex decided to get back together with her wife, and that overlapped with the new woman, before she bothered to tell her!
The 2nd attempt with the wife lasted about 3 months and ended with another spectacular bust up. Now my ex is in yet another new, fast moving relationship and throwing a hissy fit at my suggestion to not rush into introducing our kids to her new partner.
I don't care what my ex gets up to, I'm just trying to shield my kids from all this. Unfortunately, they're starting to consider it normal relationship behaviour.
So based on a sample size of one, lesbians rush relationships!