I can usually predict the next sex trend by the emails and messages I get - and right now my inboxes are screaming 'virtual reality porn'!

'I've just discovered my partner with a VR headset on, touching himself,' one woman writes, 'Now I know why he's not interested in sex with me anymore.'

The VR porn industry - computer generated simulation of three-dimensional sexual interactions - is big business.

The global value of the VR adult content market is expected to rise from more than $700US this year to $19bn by 2026.

Pornhub averages half a million views per day of the 3,000 free VR videos it offers. On Christmas Day that can shoot up to 900,000. (Turkey and party hats are clearly either exceedingly boring…or arousing.)

Like most new things with technology, VR seems sci-fi right now, but it will quickly become the norm for many people.

Currently, VR porn is aimed mostly at straight men – which is probably why I'm getting lots of messages from concerned straight women.

Having just been to an art exhibition (the Van Gogh Immersive experience) which included watching a VR video of the painter's experience of Provence, I can see why.

It was one of the most extraordinarily sensory experiences of my life – and that was without an orgasm thrown in.

So just how threatened should we be by VR porn? Is it as popular as it's made out to be – and what if you find out YOUR partner is watching it?

How easy is it to access?

For years, VR porn was expensive, scarce and a bit hit and miss. Then the porn industry pumped a lot of time and money into making it more reliable and accessible.

It still requires effort and investment in terms of both money and time, though. You can access it on your smart phone but it's not easy (most providers aren't porn friendly) and not very good.