Should we tag the vine-type penises and vaginas of flora_fauna (not directly connected to the body the way standard fauna's are) as stamen (Plant male organ) and pistil (plant female organ)?
Difference
Humorously, the larger bit in real-world plants is the pistil:
post #846921
The cord pumping the cock is a stamen while the bit going into her ass is a pistil.
Pistil-only
post #846919
This particular image features a plant which only has a pistil, no stamens (Unless you want to count the leaves), and it's being used as such.
post #846920
This one, meanwhile, uses the pistil as though it's a penis or dildo. Pistils are known for having round portions at the bottom which are basically the ovary.
Stamen
A little less popular, but here's what I've found:
post #757516
Stamen tend to have a bulb at the end, though this one is a glans so it might just be tentacle dick.
post #731286
This may just be perspective, but Bulbasaur's vine seems to be a bit more bulbous at the end, which would suggest that it is his stamen, thus creating a male/female sex image
post #730002
The way the mini-heads of the piranha plant are being used, they very well could count as stamen bulbs.
post #701559
And here we have a much more true-to-form stamen. Producing honey instead of pollen is an understandable choice when dealing with porn, where there's not much sexy about being pumped full of dust.