Attached Link: http://market.renderosity.com/softgood.ez?ViewSoftgood=29028&ViewImage=2#Image

BeccoUK has made his UniFlow prop that simulates something flowing. More waterish than sperm though it can probably be used as such as well. Most occurences of sperm are made in postwork as far as I have seen. Photoshop's Plastic Wrap gives a nice look. As SWAMP so kindly showed, there's also my morphing suds, perhaps in a scaled down version (and with another texture) it could work. If you choose to postwork yourself out of it, there's also my Bloody Mess brushes here in the Market place, they're good for other fluids than blood too (hope it's ok with a link?)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.