Actually, I'd prefer it if Bitcoin and pornography remained separate for now. Bitcoin still has a reputation for being associated with shady and often illegal activities such as drugs, gambling, hackers, assassinations, money laundering, ISIS, etc. Do we really need to add pornography to the list?
Of course fiat can be used to purchase porn and drugs too but fiat can also be used to pay your electricity bills or groceries at the supermarket - i.e. legitimate stuff. BTC doesn't quite have the same level of support yet. Businesses that accept BTC are still quite rare and having pornography become such a large part of the fledgling Bitcoin industry at this stage is probably going to hurt society's perception of the currency and possibly negate whatever economic benefits it may provide.
Anyway, that's just my opinion.
I like your perception, but I think the purpose of why bitcoin can be used in pornography and gambling site is almost internet users like the sites. I mean, we can buy groceries or any stuff what we need openly in market, yeah real life market surely. But for gambling and pornography, people love it and will spend their money just to get some pleasures from there. The problem for them, they don't want their family or relations know about it, [...]
Their families and relations can still know about it if the wallet/addresses they use for those activities can still be linked to their known wallet/addresses.