Lol! Sorry.
I think he was probably twisted before he got himself on the internet (or met TM) - the birth of the internet has just made this stuff more accessable hasn't it. Why or how someone realises they have a certain kink though is anyone's guess.
I recall an accountant who used to frequent a forum years ago. He was in to feet- to be more specific he was in to smelly feet. He used to ask people to post him their well worn slippers and other footwear so he could sniff (and got knows what else) them. If he was still around I'd ask him how he got in to
that. Another one - he liked dressing up as a maid. He used to ask for tips on how to be the perfect "lady's maid". He wanted to pop round to clean people's houses dressed like that too.
Back to VT - Holland is renowned for its




so I'm guessing his taste for it started way back. Obviously "normal"




didn't do it for him hence he's probably gone looking (and obviously found) the more extreme stuff and developed a taste for it. And we know what
that escalated to.
Some probably have a reason in their background as to why they go a certain way sexually. And some people probably don't - they're just wired to be perverse...same as I believe some people are just wired to be bad and/or evil.