It's true that there is little absolute need for an alt coin in this situation (as in most situations). However, the adult entertainment industry is known to appreciate novelty. SexCoin provides this, if nothing else. It integrates well into the fantasy; fantasy is wrapped into every aspect of adult entertainment.
Why can't Bitcoin be a novelty? Bitcoin can be sexcoin and drugscoin and whatever else you want it to be.
Bitcoin is far too slow, a transfer can take an hour or three. I really think it reigns at the top due to name recognition and hype alone, not usability. Litecoin is far more practical. When I need to transfer bitcoins between one exchange and another, I always first convert to litecoin - 3 - 5 minute wait instead of a few hours.
But to address novelty - Bitcoin cannot provide the same level novelty for the same reason that a sex toy may be called "The John Holmes" rather than "The John Doe". Most people do not want to buy the John Doe. Also, as Bitcoins become more normalized, people will come to realize it as actual money spent. Take for example a casino. One of the reasons they have you convert your money into tokens before you gamble is that people will spend tokens more freely than cash, even though it has the same value.
Did you wonder at least a minute why your transactions via BTC took 3 hours and with LTC 5 minutes?
The block time is different by a magnitude of minutes not hours.
Pay a decent fee and your transaction will be processed in minutes via BTC.
Also I would love to see how long it will take for any crytos to verify transactions once they have the same amount of daily transactions as the BTC network.