I've done a lot of testing back and forth and can only speak for my traffic and sites, but we seem to do the best with 1 trailer that has a mix of girls.
But if you go to the uber large sites, they all have a trailer for every girl. I have to assume these sites have tweaked their tours to be the best they can be, so for them that works best.
Bottom line... A/B test your tours with and without.
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