I don't think it was exactly random, the passives clearly have a bias towards the Sexy/Tease builds.
The problem is that by that point you will already have a tease build already well... built, there are VARIOUS other ways and items (such as skimpy clothing, the piercing ones, the Treatment, Pheromeones among many others) that produce the same result at level 1 so they are actually useless the more you go in detail and think about them because you already have so many way more viable alternatives from the get-go.