Is it a boon or bane to have a sexually active mom in her mid 40s who has sex with many partners?

Nothing wrong with that. It's great that your mother has a healthy sex drive and gratifies it with as many men as she can satisfy.

My ex wife has been married 6 times and divorced 6 times our daughter was had to endure 3 more step dads and numerous boyfriends of her mothers before she turned 18 and went to college.

If she's happy, nothing wrong with it. Sons shouldn't be ashamed of their parents sexuality it's something natural. If you accept it, it's great for you

What are you uncertain about?

Variety is good 😉

It’s got nothing to do with you