How, exactly, do we develop bike butt?

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yeah, I want the small round tight bike butt! even running 25-35 miles a week I never got that.

I'm waiting to see how I adjust to my new saddle. So far no pain, just some initial discomfort when I first mount, but after a minute or two it's gone. I haven't ridden a long one yet, I'm curious how the butt holds up at 15-20 miles

Don't feel bad...I peaked at 55 miles/week prior to my most recent marathon and I am just as squishy as ever. I am sure a small round tight butt is under that fluff somewhere! If I reigned-in the appetite I'm sure I could find it.

Yep, my saddle "issues" sound like yours. Just some tenderness around my sit bones when I first get on. Doesn't really bother me once I get going. I don't know if that's because the fun endorphins kick-in, or what.