How long can sperm survive outside body if added to a fertile friendly lubricant (preseed).

Nobody knows...: Nobody knows because nobody does research on such scenarios. Just imagine all the possible variations of this scenario that would have to be looked at in a research study, such as the ambient temperature (cold, cool, average, warm, hot), the presence of light (indoor, outdoor shade, outdoor sun), the humidity (low, medium, high), the surface (skin, metal, glass, plastic, cotton, rayon), etc...