Pretty rare to see anything I would describe as "hot" on the back of a Harley. Now - I HAVE seen a few of them actually riding one on their own - but that's rare too. Tzone is right about this.
It depends more on what part of the country one is residing at, IMHO...
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As for "fitting a woman on the back".....My definition of "hot" doesn't require that big seat with a backrest.
Maybe 'your' definition doesn't require that, but if you want HER to be comfy and keep riding with ya, it would behoove you to add that 'big seat and a backrest'... If nothing else, just for safety's sake..
YMMV.
And yet....hotties on sportbikes still outnumber those on Harleys. By huge factors. Except maybe in and near Wisconsin.
....but that was never why I ride in the first place.