Both cultural and personal reasons. I don't mind you asking at all
Actually my first post (the one that got eaten by the browser) went into details on my reasons and my experience in getting accustomed to sex.
The cultural part came from my Orthodox Christian upbringing. However, after about 6 years of age that began to gradually play much less of a role in my life in general. My mother is religious and from a religious family. My father is somewhat of a pagan mystic, into all the philosophies of the ancient religions that predate Christianity. So once I started going to school, my mother's Bible was replaced with science at school and ancient philosophy from my father.
I grew up with a respect for chastity, but by the time sex started being an issue in my teen years, the choice was a personal one rather than "because God said so!" which was my mother's weak, weak answer.
If my decision were merely cultural, then I most likely wouldn't have had done some of the things I have done with my husband, including an ...incident with another married couple that is bisexual and both sub. My friend's husband tried to teach his wife and I how to deepthroat my husband, but he turned out to be too much for my friend's man, too. It was a fun and very sexy experience that I don't regret.