My ex was rather girthy with a good length too. He liked a more chunkier fella cos they take it better.
He said he'd often hookup with fellas and they'd be like "oh, that's too big. Can I just suck you...?" Those he did fuck would often be demanding he finish quickly
When we became fulltime FWBs my only demand was that he go slow initially. When he was balls deep I just had to concentrate on my breathing and holding my hole open.
Lots of things at play too - he was cut and took ages to cum. He was sometimes ploughing me for a good 30mins before he came inside.
Was fun.