Pornography

Tyson has a very low sex drive, because of this he can simply ignore any urges he has without feeling any frustration from it (outside of a few patches every now and again, usually three or five weeks apart).

This in turn means that he was no use of pornography in any form, though he isn't against pornography.
...

This was a very short, very boring head canon so here is the story of the first, and only, pornographic magazine Tyson got. It is now stored in one of the many boxes under Tyson's bed, the same one that has all the comic books in it.

When he was a teenager and his hormones were still settling down Tyson's sex drive had been a little higher than it is nowadays. He'd, obviously, been curious about sex and his sexuality so whilst at a newsagents he'd 'stollen' a gay pornographic magazine. He'd hidden it between the pages of a newspaper - Sunday addition of The Independant so there were already a lot of magazines that came with the newspaper to avoid suspicion - but handed over a five pound note and said to "k-keep the, um, change."

Tyson had then taken the magazine up to the attic, where no one else went and he could be alone, to look through it. Tyson had managed to find pleasure from looking at the pictures but he'd not found it that useful. He'd always had a good imagination and the images weren't really any better than those he could create with his mind, but it did help him realise the extent of his tie kink.