Theme songs.
Tons of things have 'em, and I (dunno how, exactly, given my general lack of lyrical creativity), made a parody of one for Fakku.
*cue "Water Country" theme tune*
When your boner is raging or your pussy is hot,
The FAKKU site's a very good spot!
There's no better way to drop your tension --
FAKKU website, fap a ton!
So find a good doujin (or just an h-manga)
Masturbatin' ain't bad; religion is wrong-a!
So have a good wank from now til the morn!
FAKKU website: hentai porn!
FAKKU website, FAKKU website, FAKKU website...
HENTAI PORN!
And the religion line was meant light-heartedly. Mostly because I couldn't find anything that could work with 'masturbatin', and also rhymed with 'manga'.