DracoSuave said:
People who don't know what sex is actually like are not in a position to decide on the cleanliness of stuff they're in no way knowledgeable of.
So, you're taking the Spock argument here: people cannot have an opinion about something that they have not experienced themselves. (I'm calling this the Spock argument based on Star Trek IV, where Spock would not give his opinion on death to McCoy because McCoy "did not have a common frame of reference" with which to understand it, i.e. McCoy hadn't died yet.)
I'm a huge Trekkie and I like Spock a bunch, but this is where I have to disagree with him, and thus, with you. Taken to its fullest extent, that means I can't have an opinion on drugs if I haven't taken them. Even more ludicrously, it would mean that I can't have an opinion on eating chicken parmigiana if I've never eaten it.
One part of being human that makes us better than the animals is that
we can learn from the experiences of others, not just ourselves. I don't need to experience everything in the world to form an opinion on it. I can look towards the experiences of others to form opinions. Other, differing opinions by other people based on the same information are no more or less valid than my own, though. We take the data we have and form our own conclusions. That is part of being human.
There is a caveat to all of this, though. I will grant that having experienced something can help you form a
better opinion on that thing, especially since you'll have more data to go on. However, an opinion based on personal experience is no more or less valid than one that is based on others' experiences.