I'm enjoying this thread so I thought I'd share my experience with a mate of mine (hope it's the right place for it!)
Now I've known this guy for a good 10 years, been through a lot together and proud to call him a good mate.
He is Straight, 2 years married to a stunning woman and have 1 kid and another on the way, all content in living the straight life. Except he has a gargantuan fascination for huge cocks. He is ex-military (UK Paras, which probably explains a few things...
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To give you an idea what he looks like, a shorter version of Channing Tatum, a bit rougher round the edges, a strong defined muscular body. He is packing a thick 6" dick with an unreal amount of stamina, seriously this guy can fuck & cum like a train!
We got to know each other at a few bi fuck groups, where he always played straight but was more than happy to watch and encourage everyone to enjoy each other regardless of which way they swung. We hit it off right from the start and became good mates. We'd hang out, grab a few beers etc, or goto each others homes, have some beers, and jack off to some porn.
I noticed he always seemed to get into the 'zone' when there were hung guys on the screen and he was very verbal in that cheesy porn-talk way.
It was during one of those porn & jack sessions that he confessed that he gets crazy turned on by the sight of huge dicks. He loves the way they look, get's crazy horny knowing that guys are walking about with that amount of junk, and when he sees a guy with a huge cock fucking a girl he said he simultaneously want's to be that guy AND that girl in that exact moment. Yet he has absolutely zero desire to be emotionally or physically intimate with a guy in real life. So much so, that whenever he went on assignment he'd ask me to WhatsApp him some big dick porn, vids/gifs huge dick solos, etc etc to keep him 'entertained' on tour. It wasn't long before he had added a couple of his Para buds to the chat and had a group going, and them Military lads ain't shy! Cock compares, jack-off vids, the lot came flooding into the chat, and a lot more that can best be described as Squaddie Humour....
I found the whole thing situation horny as fuck tbh. I guess everyone has their 'thing' and huge cocks was his.