I’ve never had a girl worry about where my hands have been when I’m manually arousing her before the main penetration event. Girls who have intimacy with me are safe since I’m relatively clean, but how does she know that I didn’t just shake hands with a homeless man I met on the way to service her?
When a girl is stroking my abnormally large manhood with her hand, I could care less if her hands are a little dirty because I’m encased in a layer of skin—abrasions that would allow for infectious disease entry would come later during unprotected sex. But girls have warm, moist cavities, and what goes in may not easily come out. After all it is an incubator.