I think if I stuffed my dear husband in the boot with a dog for any length of time the dog might not survive the experience.
He is the most tender of men but his rage is also formidable. I would not unleash it on another being as I am the only person strong enough to handle him.
Re your story of a plane journey alongside a feminist, I have had extended experience of feminist women's conversation.
The topic of male physical equipment is EXTREMELY rare.
What CAN come up is discussion of supporting male embarrassment about premature ejaculation, or an inability to arise, both of which occur from time to time in any lifetime due to tiredness, stress, and just need simple reassurance. There are also extensive discussions of male ignorance founded on ideas from porn which destroys sexual skill with its inaccurate ideas. There are exchanges about male violence or sexual bullying obviously needing sisterly support. None of this relates to equipment or its measurement.
There is though a constant theme of wonderment on why men fuss so about size and therefore need so much reassurance about it. I've been in quite large group feminist discussions on a number of occasions where we asked everyone (women) there to indicate whether male size did actually matter. On one occasion this was 300 women. The response was always either none, or an eccentric odd woman out. This accords with biology because the vagina is constructed to adapt rapidly to what it is offered re size. However not on a first encounter which is why one night stands are not the best route to compatible sex.
I was bemused by the implication that the English male might ever have been considered charmers. Delightful and resourceful when you coax them into the bedroom as they are, my countrymen's charm in getting you there is not their strength. The inability to express themselves verbally, well known as a national male characteristic, does not help them. Best to just firmly guide them into intimacy yourself where they can then show their magnificence. Mind you the younger generation has been more infected by porn so perhaps they are not so wonderful these days.
If I were to do something as vulgar as look back over the several hundred lovers in my youth and pick the best culture for skill and sensitivity I'd say American Jewish. But the best all round are the Welsh. Thunder, lightning AND the delicacy of a down feather precisely placed. Which is why, reader, I married one.