I would vote "extremely open," but I come from a conservative Christian family that caused quite a stir when they found out I have a live-in boyfriend. So no, they don't need to know that I'm a sex toy fiend, kinky, polyamorous, pro-choice, or anything else about my sexuality.
Other than that, though, I love talking about sex with anyone who will listen. I particularly love giving advice for some reason. I think having satisfying sex/masturbation can be so helpful to one's mental health, self-esteem, and overall sense of self, and I just want to spread the joy!