Vince, being a keen long-distance cyclist (longest one-day ride 320km climbing 6,000m vertical in the process) so I know a thing or two about cycling knicks. My friends and I refer to the area of concern as 'the chicken neck' ... I think the analogy is clear

I know excatly what you're talking about re the hair down there.
My fave go-to is lanolin applied to said zone or conflict. It softens with body heat and isn't soluble with sweat so it's effectively a lubricant. There's also a cream made in NZ that works in a similar way, specifically designed as anti-chafe. I prefer the lanolin because it's organic and pure.
Having said all that I haven't needed to wear my cycling knicks on the moto, but definitely reckon they would be a good addition to some riders' wardrobes. BTW, all those who denigrate cyclists and 'their fukn lycra' have obviously never ridden a bicycle further than their corner shop.