How to change shiness on textures?

[theHatzel]

Hello! Using sexlab here I found the cum textures too shiny and I wanted to reduce this shiness to make them more realistic and less weird at night or dark places. I already located the texture files here but I don't know wich of the RGBA chanels are the responsable for the shiness or if reducing the color on this channel is the right way fix this. 

If I manage to do it I will upload the files here because I supose that this might be something that bothers more people.

 

Thank you!

[-alpha-]

the alpha layer.