Honestly, the only thing that I hate about this pictire is the artists lack of creativity. All of the mobs in the image (barring the ghast of course) seem to have the same exact reproductive organs, which doesnt really make sense to me. For example when the slime is killed is divides itself into 4 smaller slimes as a defence mechanism, which implies that minecraft slimes may in fact be able to reproduce asexualy. Ofcourse, one may argue that the smaller slimes may be unable to reproduce, but if that was the case, then how would such a defense mechanism persist? I think it makes sense that slime (and magma cubes) would be hermaphrodites. I imagene they would have long, thin prehensile penises (to compensate for the poor mobility of the slime) that shoot sperm to a relatively large distance. Every mating season, they would gather in the swamps and have penis fencing matches (similar to flatworms) to see who gets to carry offspring.