I honestly don't see what there is to be offended at here. It's a documentary on something that's a core part of life as a whole. There's a lot to discuss, a lot to document... It seems like a great match for a documentary to me. Would I watch it? Nah, I don't even watch TV, there's not enough content that interests me to make it worth the time and money. But what is there to be offended about with this program? Sex is intimate, but I don't see why it's often considered "dirty". Yes, it can be dirty (the specifics of what you consider dirty depending on your personal beliefs to an extent, but I don't think many will disagree that things like, for example, extramarital affairs are "dirty" in some sense of the word), but sex in and of itself is not some inherently dirty thing that shouldn't be discussed. Heck, if it weren't for sex you wouldn't exist right now. In fact, maybe this documentary actually has some interesting things to say about varying views on sex being a taboo subject, and why some people don't like discussing it, in which case it could be interesting to watch for those wondering about it. But honestly, I don't give a darn about most of what's on TV anyway, I just occasionally watch MythBusters clips on YouTube and that's it, so meh.