I don't remember having a real, sit-down "talk" about sex, aside from her telling me that if anyone touched me there that I was supposed to tell her no matter what. She was molested when she was a kid and didn't know to tell anyone, and it still bothers her now, so she wanted to make sure I never went through that.
I think at some point I had questions that needed to be answered, so my mom told me, kind of. She used to have a much different opinion of things. She told me everyone masturbates, but that it was a sin and I shouldn't do it. That caused me years of needless guilt because, of course, I masturbated anyway. I got a yeast infection when I was 12 and didn't tell anyone because I thought that it was punishment for masturbating. Sigh.
She also told me to wait until marriage to have sex, and she only said something about anal because that was also "a sin," and painful and dirty.
I've told her since I've gotten older what her "talks" had done to me. That I felt ashamed of myself for masturbating when I was younger. She regrets it now. She's also a lot more educated as far as sex goes because of my being part of this site. We have a better, more open relationship than when I was little, so I've told her that I believe anal is fine when done in a safe way.
I don't have kids, but when I do, I plan not to really have a "talk" necessarily, but I will bring it up when I need to. I will make sure my kids are informed about everything they need to be to have a safe and happy sex life, so I will bring up anal when I feel I should.