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There is a genre of JAV in which they use a semen resembling viscous liquid. I forget what the genre is called, but you're not supposed to think it's real semen.



The genre is known as 'lotion' in Japan, or 'WAM' as in 'Wet and Messy' in the West.

The substance the Japanese use is Methyl Cellulose (or some variation thereof), which is a common ingredient in many cosmetic products such as toothpaste, shampoo and shower gels. It can be used all over the body without fear of reaction or inflammation, and can even be swallowed, although this is not advisable in large quantities as it has some potent laxative qualities (another product it is often used in, as it softens the stool).

It's a tried and trusted standby in the special effects biz for most any kind of slime or goop, just like KY jelly!