I have a theory heavily influenced by my predilection for size humiliation. I refer to the below article which arouses me more than any porn - a women's magazine effectively saying size counts while providing a big cock user guide for their readers.
From high-fiving to 'ouucchh', having sex with the well-endowed can be V complex.
www.cosmopolitan.com
The main thing they emphasise is the requirement to take your time with a huge one ("gone are the days of quick poundings with your knickers still halfway down your legs"). Not only does going slow allow the receiver to adjust to the monolith going inside them it also ensures the sex lasts longer (obvs), which is pretty darn important given "likelihood or consistency of partnered orgasm is associated with penile-vaginal intercourse duration".^1
From my experience as a pencil dick it's literally seconds before I'm able to be fully inserted and can obviously move to full throttle (and thus ejaculation) much sooner than would a competently applied thick one. Thus, I am usually done in the 3-5 minutes it would take a woman to adjust to a big one (in my case this is exacerbated by intercourse for me usually being either the footnote to my wife getting off with her vibrator or her just getting it over with by tickling my balls).
A lot of the naysayers in the size counts debate are women who say they tried a big one and it was uncomfortable. I think these experiences though are the result of the well hung individual not taking their time. As per the article if a guy with a big cock has "played by the foreplay rules, then you're pretty much guaranteed to have totally amazing orgasms. With a penis that size it's impossible not to hit the spot."
Would love to hear from those with first hand experience whether this theory holds up in real life.
^1
https://pubmed.ncbi.nlm.nih.gov/19170844/