How much information is too much?
How much detail do you want as far as the sexual relationships of your partners do you want/need? I finding that I'm fine just knowing that it happens and don't go looking for details. I'm also very cautious not to refer to sexual experiences with a partner with their other partners. I'm also finding though, that this seems to be the exception. Others seem to want to give much more detailed information.
I suppose there is a tinge of jealousy for me in hearing it all. But mostly, it's about privacy. I like the idea that there are some things in each relationship that are "sacred." Hmm...pondering.