does backlinking to a site in the same niche give a stronger google boost?

For example, let's say you want to promote an asian girls blog. and you are going to create other sites largely for the purpose of linking to that asian girls blog to boost its pagerank, search engine rankings, etc. Would it be better to create like an asian blowjob site, an asian teen site, an asian gangbang site, etc, all kind of related to the main site's theme, and put links on those sites to your asian blog (the one you're trying to boost up) ?

Or would it have the exact same level of effectiveness if you created ANY adult-oriented sites and linked them to your asian girls blog. ex: you create a black girls site, an anal site, a cfnm site, a big boobs site, etc etc and link all those to the asian girls blog.

Reason for the question is, if the second variant is just as effective as the first, it seems like a better route to go, because then you can trade links with a broader range of webmasters.