Bad reputation ? like what ? I think bitcoin is fine. Bitcoin is digital currency and online things. And porn like registration and any else, many people need to be anonymous to do it. so i think bitcoin is good for it.
Not everyone likes to leave their name with a credit card when paying for erotic services and then see the names of porn sites on your bank statements
Bitcoin simply avoids awkward situations.
Imagine that you are going to negotiate a credit, and there in the first position - the monthly subscription fee for pornhub
a little funny