Pornography is not suddenly a great and important piece of culture just because it was nicely painted with a brush a long time ago. It is still pornography.
What do you mean by “getting some culture”? You mean perhaps studying art history? Because I guarantee countless artists, art historians and critics would deny this painting has much cultural value. The whole style has been heavily and justifiably derired. If anything, what is conservative here is the painting’s view of women (painted according to the sexual tastes of rich European men) and stereotypical treatment of foreign culture.
Why do you think that every image of a naked person is pornography? What kind of a sick mindset is that? Do you think every anatomy book is pornography?