Much like how a lot of people consume zombie "horror" movies less for a "horror" experience and more to get off to power fantasies of mowing down dehumanized "others," I think a lot of people that are into "adult humor" games aren't really there for a natural laugh as much as for the "clapter" of the edgy word combination and how it must trigger delicate snowflakes or the like.

In general, if something has to market itself as "adult" or "mature," to me it usually translates as "teenagers and people that never quite stopped acting like teenagers see this as adult/mature."