Melondream is an app written in golang (using gomobile). It's almost entirely native code, with a small amount of java Android framework on top. Not clear how to translate such a thing into a webapp.

Surely you can imagine applications beyond pornography! The "soft1" server has tens of thousands of photos, indexed by content. Each photo has a web link (the VISIT button).

As for erotica, you can for example search this huge catalog of nudes by genital (vulva) structure. Find one you like, then see who it's attached to. Yes it's depraved, but...

Or faces. Search for faces with a feature you like.