Despite the abundance of free filth.
A new report from Juniper Research says the sharp rise in smartphone and tablet ownership will fuel the growth, particularly as the majority of tablets will be in the same regions that have historically spent the most on adult subscriptions.
There's a simple reason for this. Let's not be squeamish: a bigger and better screen equals more realistic sauce.
Niche tastes will also continue to drive users towards subscription accounts, as will services that cannot be cannibalised by free services - notably video chat. Juniper reckons the number of chat users will more than triple by 2015 to account for over half of mobile adult content revenues by 2015.
Unsurprisingly, the report found that growth in emerging markets growth would be hampered by the dominance of feature phones and low credit card penetration.
Regulation and social disapproval would also suppress these markets.
Thus North America and Western Europe with account for over 70 per cent of total end-user mobile adult revenues.
Report author Charlotte Miller said: ‘Mobile adult subscriptions will be a growing source of mobile adult revenues. Niche contet has always been a driver of paid adult content and this is no less true on mobile. While there has been a proliferation of free content, it remains that case that for specialised content, users must continue to pay.’